Gr 10 Physical Sciences Ch 13: Current
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Questions and Answers

What is the relationship between the strength of the electrostatic force and the distance between charges?

  • Directly proportional to the square of the distance
  • Inversely proportional to the square of the distance (correct)
  • Directly proportional to the distance
  • Inversely proportional to the square root of the distance

    • What happens when a positively charged glass rod is brought close to a negatively charged plastic rod?

  • The rods become neutral
  • Attraction occurs (correct)
  • Repulsion occurs
  • No force is present

    • What is the result of rubbing a glass rod with silk?

  • The glass rod becomes positively charged (correct)
  • The glass rod remains neutral
  • The glass rod becomes negatively charged
  • The glass rod becomes magnetically charged

    • What is the property of water molecules that causes them to align with their negative sides towards a positively charged rod?

    <p>Dipolarity</p> Signup and view all the answers

    What happens when a similarly charged glass rod is brought close to another glass rod?

    <p>Repulsion occurs</p> Signup and view all the answers

    What is the result of bringing a positively charged object close to a stream of water?

    <p>The stream of water is attracted to the object</p> Signup and view all the answers

    What is the potential difference measured across a battery's terminals when it is not connected to a circuit?

    <p>EMF</p> Signup and view all the answers

    What is the rate at which charge moves past a fixed point in a circuit?

    <p>Current</p> Signup and view all the answers

    What is the unit of measurement for current?

    <p>Ampere</p> Signup and view all the answers

    How does an ammeter measure current in a circuit?

    <p>Connected in series with the circuit component</p> Signup and view all the answers

    What happens when a charged object is brought near a neutral insulator?

    <p>The insulator becomes polarized</p> Signup and view all the answers

    What is the characteristic of materials with natural dipoles?

    <p>They are neutral overall but have distinct positive and negative sides</p> Signup and view all the answers

    What happens when excess charge is placed on a conductor?

    <p>The charge spreads out uniformly</p> Signup and view all the answers

    What is the result of two identical conductors touching and then separating?

    <p>Each conductor has half of the total charge</p> Signup and view all the answers

    What is the electrostatic force between like charges?

    <p>Repulsion</p> Signup and view all the answers

    What is the electrostatic force between opposite charges?

    <p>Attraction</p> Signup and view all the answers

    What is the driving force that enables the flow of electric charge through a circuit?

    <p>Electromotive force</p> Signup and view all the answers

    Which of the following is a measure of the energy required to move a charge from one point to another in an electric field?

    <p>Potential difference</p> Signup and view all the answers

    What is the unit of potential difference?

    <p>Volts</p> Signup and view all the answers

    How is a voltmeter connected to measure the potential difference across a circuit component?

    <p>In parallel with the component</p> Signup and view all the answers

    What is the maximum potential difference between the terminals of a battery or power source when no current is flowing?

    <p>Electromotive force</p> Signup and view all the answers

    What is the purpose of electromotive force in a circuit?

    <p>To enable current flow</p> Signup and view all the answers

    What is the mathematical expression for potential difference?

    <p>V = W/Q</p> Signup and view all the answers

    What does a voltmeter measure when connected in parallel with a battery or power source?

    <p>The terminal voltage</p> Signup and view all the answers

    What is the work done per unit charge in an electric field?

    <p>Energy required to move a charge from one point to another</p> Signup and view all the answers

    What is the purpose of a voltmeter in a circuit?

    <p>To measure the potential difference between two points in a circuit</p> Signup and view all the answers

    What is the unit of electromotive force (EMF)?

    <p>Volts (V)</p> Signup and view all the answers

    What is the driving force that enables the flow of electric charge through a circuit?

    <p>Electromotive force (EMF)</p> Signup and view all the answers

    What is the type of force that occurs between two like charges?

    <p>Electrostatic force</p> Signup and view all the answers

    What happens when a negatively charged plastic rod is brought close to a positively charged glass rod?

    <p>The rods will attract each other</p> Signup and view all the answers

    What is the mathematical expression for potential difference?

    <p>V = W / Q</p> Signup and view all the answers

    How is a voltmeter connected to measure the potential difference across a circuit component?

    <p>In parallel with the circuit component</p> Signup and view all the answers

    What is the property of water molecules that allows them to be attracted to a charged object?

    <p>Polarity</p> Signup and view all the answers

    What is the maximum potential difference between the terminals of a battery or power source when no current is flowing?

    <p>Electromotive force (EMF)</p> Signup and view all the answers

    What is the result of bringing a charged object close to a stream of water?

    <p>The water stream is attracted to the object</p> Signup and view all the answers

    What is the energy required to move a charge from one point to another in an electric field equivalent to?

    <p>One joule per coulomb</p> Signup and view all the answers

    What is demonstrated by the experiment of rubbing a glass rod with silk and hanging it from a string?

    <p>The principle of electrostatic force</p> Signup and view all the answers

    What is the characteristic of electrostatic force that is observed when two charged objects are brought close together?

    <p>It is inversely proportional to the square of the distance</p> Signup and view all the answers

    What is the difference between the EMF and the terminal voltage of a battery?

    <p>EMF is the potential difference when the battery is part of a complete circuit, while terminal voltage is the maximum potential difference the battery can provide.</p> Signup and view all the answers

    What is the purpose of an ammeter in a circuit?

    <p>To measure the current flowing through a circuit component.</p> Signup and view all the answers

    What happens when a charged object is brought near a neutral insulator?

    <p>The electrons and nuclei in the insulator are slightly shifted, creating a dipole.</p> Signup and view all the answers

    What is the characteristic of conductors that enables them to distribute charge evenly?

    <p>Electrons can move freely through the material.</p> Signup and view all the answers

    What is the result of two identical conductors touching and then separating?

    <p>Each conductor has half of the total charge after separation.</p> Signup and view all the answers

    What is the force that acts between static electric charges?

    <p>Electrostatic force</p> Signup and view all the answers

    What is the direction of the force between two like charges?

    <p>The force is repulsive.</p> Signup and view all the answers

    What is the result of polarisation in an insulator?

    <p>A dipole is created within the atoms of the insulator.</p> Signup and view all the answers

    What is the purpose of the battery in a circuit?

    <p>To drive the charges through the circuit.</p> Signup and view all the answers

    What is the result of a charged object being brought near a stream of water?

    <p>The water molecules are attracted to the charged object.</p> Signup and view all the answers

    What is the unit of measurement for potential difference?

    <p>Volts</p> Signup and view all the answers

    How does a voltmeter measure the potential difference across a circuit component?

    <p>It is connected in parallel with the component</p> Signup and view all the answers

    What is electromotive force (EMF) equivalent to?

    <p>The maximum work done per unit charge to move it through the entire circuit</p> Signup and view all the answers

    What is the purpose of electromotive force in a circuit?

    <p>To enable the flow of electric charge through the circuit</p> Signup and view all the answers

    What is potential difference measured by?

    <p>A voltmeter</p> Signup and view all the answers

    What is the mathematical expression for potential difference?

    <p>V = W/Q</p> Signup and view all the answers

    What is the difference between EMF and terminal voltage?

    <p>EMF is the maximum potential difference, while terminal voltage is the actual potential difference</p> Signup and view all the answers

    What is the function of a battery or power source in a circuit?

    <p>To enable the flow of electric charge through the circuit</p> Signup and view all the answers

    What is the reason for the attraction between the glass rod and the stream of water?

    <p>The glass rod is positively charged and the water molecules are polarized</p> Signup and view all the answers

    What is the effect of bringing a similarly charged glass rod close to another glass rod?

    <p>Repulsion</p> Signup and view all the answers

    Why does the electrostatic force between two charges weaken as they move further apart?

    <p>Because the distance between them increases</p> Signup and view all the answers

    What is the purpose of the experiment of rubbing a glass rod with silk and hanging it from a string?

    <p>To demonstrate the principles of electrostatic force</p> Signup and view all the answers

    What is the characteristic of water molecules that allows them to be aligned by an electric field?

    <p>They are dipolar</p> Signup and view all the answers

    What is the relationship between the electrostatic force and the distance between charges?

    <p>The force decreases as the distance increases</p> Signup and view all the answers

    What is the main difference between the EMF and the terminal voltage of a battery?

    <p>The EMF is higher than the terminal voltage due to internal resistance.</p> Signup and view all the answers

    What is the purpose of an ammeter in a circuit?

    <p>To measure the current flowing through a circuit component.</p> Signup and view all the answers

    What is the characteristic of insulators that prevents them from distributing charge evenly?

    <p>Electrons are bound to atoms and cannot move freely.</p> Signup and view all the answers

    What is the result of polarisation in an insulator?

    <p>A separation of charge within the atoms of the insulator.</p> Signup and view all the answers

    What is the force that acts between static electric charges?

    <p>Electrostatic force.</p> Signup and view all the answers

    What happens when two identical conductors touch and then separate?

    <p>Each conductor shares the total charge equally.</p> Signup and view all the answers

    What is the direction of the force between two like charges?

    <p>Repulsive.</p> Signup and view all the answers

    What is the purpose of the battery in a circuit?

    <p>To drive the flow of electric charge through the circuit.</p> Signup and view all the answers

    What happens when a charged object is brought near a neutral insulator?

    <p>The insulator is polarized, creating a dipole.</p> Signup and view all the answers

    What is the characteristic of materials with natural dipoles?

    <p>They have distinct positive and negative sides while being electrically neutral overall.</p> Signup and view all the answers

    What is the primary function of electromotive force in an electric circuit?

    <p>To push the charge around the circuit, enabling current flow</p> Signup and view all the answers

    A voltmeter measures the potential difference between two points in a circuit when connected in:

    <p>Parallel with the circuit component</p> Signup and view all the answers

    What is the unit of measurement for the work done per unit charge in an electric field?

    <p>Volts (V)</p> Signup and view all the answers

    What is the mathematical expression for potential difference?

    <p>V = W / Q</p> Signup and view all the answers

    What is the energy required to move a charge from one point to another in an electric field equivalent to?

    <p>One joule per coulomb</p> Signup and view all the answers

    What is the purpose of a voltmeter in a circuit?

    <p>To measure the potential difference between two points in the circuit</p> Signup and view all the answers

    What is the maximum potential difference between the terminals of a battery or power source when no current is flowing?

    <p>Electromotive force (EMF)</p> Signup and view all the answers

    What is the driving force that enables the flow of electric charge through a circuit?

    <p>Electromotive force (EMF)</p> Signup and view all the answers

    What is the primary reason why the terminal voltage of a battery is less than its EMF?

    <p>Due to the energy used to drive the charge through the battery</p> Signup and view all the answers

    What is the outcome when two identical conductors touch and then separate?

    <p>Each conductor will have half of the total charge after separation</p> Signup and view all the answers

    What is the characteristic of materials with natural dipoles that allows them to be attracted to charged objects?

    <p>Their ability to polarize</p> Signup and view all the answers

    What is the purpose of the battery in a circuit?

    <p>To drive the flow of electric charge through the circuit</p> Signup and view all the answers

    What happens when a charged object is brought near a neutral insulator?

    <p>The insulator polarizes and is attracted to the charged object</p> Signup and view all the answers

    What is the result of polarisation in an insulator?

    <p>The insulator is attracted to the charged object</p> Signup and view all the answers

    What is the difference between the EMF and the terminal voltage of a battery?

    <p>The EMF is the maximum potential difference, while the terminal voltage is less than the EMF due to internal resistance</p> Signup and view all the answers

    Why do the water molecules align with their negative sides towards a positively charged rod?

    <p>Because the water molecules are polarised and have a distinct negative region</p> Signup and view all the answers

    What is the characteristic of conductors that enables them to distribute charge evenly?

    <p>Their ability to conduct electricity</p> Signup and view all the answers

    What is the reason for the attraction between a negatively charged plastic rod and a positively charged glass rod?

    <p>Because the rods have opposite charges</p> Signup and view all the answers

    What is the result of bringing a similarly charged glass rod close to another glass rod?

    <p>Repulsion between the rods</p> Signup and view all the answers

    What is the direction of the force between two like charges?

    <p>Repulsion</p> Signup and view all the answers

    What is demonstrated by the experiment of rubbing a glass rod with silk and hanging it from a string?

    <p>The attraction between opposite charges</p> Signup and view all the answers

    Why does the electrostatic force between two charges decrease with increasing distance?

    <p>Because the strength of the electrostatic force is inversely proportional to the square of the distance between the charges</p> Signup and view all the answers

    What is the purpose of the experiment involving rubbing a glass rod with silk and hanging it from a string?

    <p>To demonstrate the principles of electrostatic force</p> Signup and view all the answers

    What is the characteristic of polarised molecules that allows them to align with their negative sides towards a positively charged rod?

    <p>They have a distinct negative region</p> Signup and view all the answers

    What is the direction of the electrostatic force between two oppositely charged objects?

    <p>Towards each other</p> Signup and view all the answers

    Why are water molecules attracted to a positively charged rod?

    <p>Because water molecules are dipolar and align with their negative sides towards the rod</p> Signup and view all the answers

    What happens when two similarly charged glass rods are brought close together?

    <p>They repel each other</p> Signup and view all the answers

    What is the purpose of the simple experiment with a glass rod and silk?

    <p>To demonstrate the principles of electrostatic force</p> Signup and view all the answers

    What is the relationship between the strength of the electrostatic force and the distance between the charges?

    <p>Inversely proportional to the square</p> Signup and view all the answers

    What is the main reason why a charged object can attract a neutral insulator?

    <p>The charged object polarizes the molecules of the neutral insulator</p> Signup and view all the answers

    What is the characteristic of the electrostatic force that makes it a short-range force?

    <p>It is inversely proportional to the square of the distance between the charges</p> Signup and view all the answers

    What is the main reason why water molecules are polarized in the presence of an electric field?

    <p>Water molecules align with their negative sides towards the electric field due to their polar nature</p> Signup and view all the answers

    What happens when a charged object is brought close to a polarized insulator?

    <p>The charged object attracts the polarized insulator</p> Signup and view all the answers

    What is the main difference between the electrostatic force between like charges and opposite charges?

    <p>The electrostatic force between like charges is repulsive, while the force between opposite charges is attractive</p> Signup and view all the answers

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