Electric Charge Quiz
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Questions and Answers

Which type of charge does a proton have?

  • Both positive and negative charges
  • Neutral charge
  • Positive charge (correct)
  • Negative charge

    • What is the SI unit of charge?

  • Ampere
  • Volt
  • Coulomb (correct)
  • Ohm

    • Which type of charge does an electron have?

  • Positive charge
  • Negative charge (correct)
  • Neutral charge
  • Both positive and negative charges

    • What happens when two charges of the same type (positive or negative) are brought close together?

    <p>The force between them is repulsive (D)</p> Signup and view all the answers

    What happens when two charges of different types (positive and negative) are brought close together?

    <p>The force between them is attractive (A)</p> Signup and view all the answers

    What is a conductor?

    <p>A material through which charge flows easily (B)</p> Signup and view all the answers

    What is an insulator?

    <p>A material that does not conduct electricity (C)</p> Signup and view all the answers

    What happens to electrons in a conductor?

    <p>They are able to hop from atom to atom (D)</p> Signup and view all the answers

    What is the simplest way to induce a charge on many common materials?

    <p>Rubbing unlike materials together (A)</p> Signup and view all the answers

    What is the charge of a neutron?

    <p>Neutral charge (B)</p> Signup and view all the answers

    Which object ends up with a net positive charge when two objects made of unlike materials are rubbed together?

    <p>The object made of the most electropositive material (A)</p> Signup and view all the answers

    What happens to the total charge when two objects made of unlike materials are rubbed together?

    <p>The total charge remains the same (A)</p> Signup and view all the answers

    What is polarization?

    <p>The separation of charge within an object (D)</p> Signup and view all the answers

    What are the three types of polarization?

    <p>Permanent, induced, and instantaneous (D)</p> Signup and view all the answers

    What is permanent polarization?

    <p>When one side of a molecule is more positive than the other (D)</p> Signup and view all the answers

    What is induced polarization?

    <p>When charges accumulate on the ends of a conductor (D)</p> Signup and view all the answers

    What happens to charges in a conductor during induced polarization?

    <p>Charges can move throughout the conductor (A)</p> Signup and view all the answers

    What happens to charges in an insulator during induced polarization?

    <p>Charges are bound to a particular location in the insulator (D)</p> Signup and view all the answers

    What is the net charge of an object that is polarized?

    <p>Zero (A)</p> Signup and view all the answers

    What is the name for molecules that have a permanent separation of charge within them?

    <p>Polar molecules (B)</p> Signup and view all the answers

    According to Coulomb's law, the force between two electric charges is directly proportional to the product of the charges and inversely proportional to their separation squared. Which equation represents Coulomb's law?

    <p>$F = k \frac{q_1 q_2}{r}$ (B)</p> Signup and view all the answers

    What is the magnitude of the electric force between two charges of magnitude $q_1 = 2 \mu C$ and $q_2 = 3 \mu C$ separated by a distance of 2 meters?

    <p>$1.44 N$ (A)</p> Signup and view all the answers

    If the charge $q_2$ in the previous question is negative, how would the direction of the electric force change?

    <p>It would become attractive (D)</p> Signup and view all the answers

    What is electrocardiography (ECG) used for?

    <p>Recording the electrical activity of the heart (D)</p> Signup and view all the answers

    What does an electrocardiogram (ECG) detect?

    <p>The electrical changes on the skin (D)</p> Signup and view all the answers

    What is the SI unit of charge?

    <p>Coulomb (C) (C)</p> Signup and view all the answers

    What is the net charge of an object that is polarized?

    <p>Zero (A)</p> Signup and view all the answers

    What happens to charges in a conductor during induced polarization?

    <p>Charges move freely within the conductor (C)</p> Signup and view all the answers

    What is the name for molecules that have a permanent separation of charge within them?

    <p>Polar molecules (C)</p> Signup and view all the answers

    What happens to electrons in a conductor?

    <p>Electrons move freely within the conductor (D)</p> Signup and view all the answers

    Which of the following is true about the electrical signal generated at the sinoatrial (SA node) of the heart?

    <p>It causes the contraction of the atria (A)</p> Signup and view all the answers

    What is the normal range of the pacemaking signal from the SA node in the heart?

    <p>Between 60 and 100 beats/min (A)</p> Signup and view all the answers

    What is the potential difference between the inside and outside of the cells of the outer membrane of the heart at the resting state?

    <p>Around 90 mV (B)</p> Signup and view all the answers

    What is the primary tool used for detecting abnormal heart rhythms?

    <p>Electrocardiogram (ECG) machines (C)</p> Signup and view all the answers

    What does the P wave on an electrocardiogram (ECG) represent?

    <p>Depolarization of the atria (D)</p> Signup and view all the answers

    What does the QRS complex on an electrocardiogram (ECG) represent?

    <p>Depolarization of the ventricles (C)</p> Signup and view all the answers

    What does the T wave on an electrocardiogram (ECG) represent?

    <p>Repolarization of the ventricles (A)</p> Signup and view all the answers

    What is the SI unit of capacitance?

    <p>Farad (A)</p> Signup and view all the answers

    What does the capacitance of a capacitor depend on?

    <p>The dielectric constant (A)</p> Signup and view all the answers

    What is the capacitance of 1 cm^2 of membrane that separates ions inside and outside a cell, with a dielectric constant of 8?

    <p>7.08 × 10^-7 F (D)</p> Signup and view all the answers

    Which of the following is true about the electrical signal in the heart?

    <p>It occurs at a rate between 60-100 beats/min (A)</p> Signup and view all the answers

    What is the potential difference between the inside and outside of the cells in the outer membrane of the heart at the resting state?

    <p>90 mV (D)</p> Signup and view all the answers

    What is the primary tool used for detecting abnormal heart rhythms?

    <p>Electrocardiogram (ECG) (D)</p> Signup and view all the answers

    What does the first bump (P wave) on an electrocardiogram (ECG) represent?

    <p>Depolarization of the atria (D)</p> Signup and view all the answers

    What does the last bump (T wave) on an electrocardiogram (ECG) represent?

    <p>Repolarization of the ventricles (B)</p> Signup and view all the answers

    What does the sharper feature in the middle (QRS complex) on an electrocardiogram (ECG) represent?

    <p>Depolarization of the ventricles (A)</p> Signup and view all the answers

    What is the formula for the capacitance of a capacitor?

    <p>$C = KA/d$ (B)</p> Signup and view all the answers

    What factors affect the capacitance of a capacitor?

    <p>Dielectric constant, plate area, and distance between plates (B)</p> Signup and view all the answers

    What is the capacitance of 1 cm^2 of membrane with a dielectric constant of 8?

    <p>$0.708 \mu F$ (C)</p> Signup and view all the answers

    What is the nerve cell's behavior similar to in terms of electrical conduction?

    <p>Capacitor (A)</p> Signup and view all the answers

    What is the resting membrane potential of a nerve cell?

    <p>-70 mV to -90 mV (B)</p> Signup and view all the answers

    During the active state of a nerve cell, what happens to the cell membrane permeability?

    <p>It increases suddenly (A)</p> Signup and view all the answers

    What is the approximate duration of an action potential in a nerve cell?

    <p>0.3ms (A)</p> Signup and view all the answers

    What is the primary mechanism responsible for the exchange of substances between the cell interior and the environment?

    <p>Diffusion (B)</p> Signup and view all the answers

    What is the role of the Na-K pump in a nerve cell?

    <p>It pumps sodium into the cell and potassium out of the cell (C)</p> Signup and view all the answers

    What is the range of the resting membrane potential of a nerve cell?

    <p>-70 mV to -90 mV (B)</p> Signup and view all the answers

    What is the polarity of the charge across the membrane during each stage of the nerve cell's electrical potential?

    <p>It keeps changing (B)</p> Signup and view all the answers

    What is the primary factor that determines the signal conduction velocity along a nerve axon?

    <p>Axon's diameter (A)</p> Signup and view all the answers

    What happens to the potential difference across the capacitors as one goes farther from the stimulus?

    <p>It decreases gradually (B)</p> Signup and view all the answers

    What is the approximate time required for the Na-K pump to restore the ions in a nerve cell?

    <p>50ms (D)</p> Signup and view all the answers

    What is the SI unit of electric current?

    <p>Ampere (A) (A)</p> Signup and view all the answers

    What is Ohm's law?

    <p>The resistance of a conductor is the potential difference between its ends divided by the current. (A)</p> Signup and view all the answers

    What is the opposition to the flow of electrical current through an object known as?

    <p>Resistance (A)</p> Signup and view all the answers

    What are materials that do not obey Ohm's law known as?

    <p>Non-Ohmic (D)</p> Signup and view all the answers

    What is the approximate capacitance of cell membranes?

    <p>10-2 Fm-2 (D)</p> Signup and view all the answers

    What is the name for a two-molecule thick membrane formed from a phosphate group and a hydrocarbon chain?

    <p>Bilayer (C)</p> Signup and view all the answers

    What are materials called when the potential difference and the current are directly proportional?

    <p>Ohmic (C)</p> Signup and view all the answers

    What is the SI unit of electrical resistance?

    <p>Ohm (Ω) (C)</p> Signup and view all the answers

    What is the formula for electric resistance?

    <p>𝑹 = 𝑽 𝑰 (A)</p> Signup and view all the answers

    What is the formula for finding the electric resistance?

    <p>𝑹 = 𝑽 𝑰 (C)</p> Signup and view all the answers

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