Gr 11 Physical Sciences: Ch 8 Sum Electromagnetism
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Questions and Answers

What is generated by an electric current flowing through a wire?

  • A thermal field
  • An electric field
  • A magnetic field (correct)
  • A gravitational field

    • What is the direction of the magnetic field lines produced by a current-carrying wire?

  • Diagonal to the direction of the current flow
  • Opposite to the direction of the current flow
  • Parallel to the direction of the current flow
  • Perpendicular to the direction of the current flow (correct)

    • What is the shape of the magnetic field lines around a current-carrying wire?

  • Concentric squares
  • Concentric rectangles
  • Concentric circles (correct)
  • Concentric triangles

    • What is the Right Hand Rule used to determine?

    <p>The direction of the magnetic field</p> Signup and view all the answers

    How does the strength of the magnetic field relate to the current?

    <p>It is directly proportional to the current</p> Signup and view all the answers

    What is represented by the symbol ( \odot ) in visualizing magnetic fields?

    <p>An arrow coming out of the page</p> Signup and view all the answers

    What happens to the magnetic field lines as you move closer to the wire?

    <p>They become stronger</p> Signup and view all the answers

    What is observed when a compass is placed near a current-carrying wire?

    <p>The compass needle is deflected by the wire</p> Signup and view all the answers

    What is the shape of the magnetic field around a straight wire?

    <p>Concentric circles</p> Signup and view all the answers

    What is the direction of the magnetic field emerging from a loop of wire according to the Right Hand Rule?

    <p>In the direction of your thumb</p> Signup and view all the answers

    What is the characteristic of the magnetic field inside a solenoid?

    <p>Stronger and uniform</p> Signup and view all the answers

    What is the purpose of electromagnets?

    <p>To maximize the magnetic field strength</p> Signup and view all the answers

    Why are power lines a threat to certain bird species?

    <p>Because they are not visible to birds</p> Signup and view all the answers

    What is the frequency of the magnetic fields generated by power lines?

    <p>Low frequency</p> Signup and view all the answers

    What is the principle of electromagnetic induction discovered by Michael Faraday?

    <p>A moving magnet induces a voltage</p> Signup and view all the answers

    What is the unit of magnetic flux?

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

    What is the angle between the magnetic field and the normal to the loop of area A in the formula for magnetic flux?

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

    What is the condition for a magnetic field to induce a current in a loop?

    <p>The magnetic field is perpendicular to the loop</p> Signup and view all the answers

    What is the direction of the induced emf in a loop according to Faraday's Law of Electromagnetic Induction?

    <p>Opposite to the change in magnetic flux</p> Signup and view all the answers

    What is the relationship between the induced emf and the rate of change of magnetic flux in Faraday's Law of Electromagnetic Induction?

    <p>The induced emf is directly proportional to the rate of change of magnetic flux</p> Signup and view all the answers

    What is the purpose of the Right Hand Rule in Faraday's Law of Electromagnetic Induction?

    <p>To determine the direction of the induced current</p> Signup and view all the answers

    What is the application of electromagnetic induction in electrical generators?

    <p>Converting mechanical energy into electrical energy</p> Signup and view all the answers

    What is the principle behind self-induction?

    <p>A changing magnetic field induces a voltage along the same wire</p> Signup and view all the answers

    What is the purpose of Lenz's Law?

    <p>To ensure that the direction of the induced emf always works to counteract the change that caused it</p> Signup and view all the answers

    What is the formula for the magnetic flux through a loop?

    <p>= B * A</p> Signup and view all the answers

    What is the effect of an approaching south pole of a magnet on a loop?

    <p>The induced current generates a magnetic field that opposes the south pole's field</p> Signup and view all the answers

    What is the direction of the induced current in a loop when a south pole of a magnet approaches the loop?

    <p>The current flows in a direction that opposes the south pole</p> Signup and view all the answers

    What is the purpose of Lenz's Law?

    <p>To ensure that the induced current opposes the change in magnetic flux</p> Signup and view all the answers

    What is the relationship between the number of turns in a loop and the induced emf?

    <p>The induced emf is directly proportional to the number of turns</p> Signup and view all the answers

    What is the application of electromagnetic induction in electrical generators?

    <p>To convert mechanical energy into electrical energy</p> Signup and view all the answers

    What happens to the direction of the magnetic field lines when the direction of the current flow changes?

    <p>The direction of the magnetic field lines reverses</p> Signup and view all the answers

    What is the relationship between the strength of the magnetic field and the distance from the wire?

    <p>The strength of the magnetic field decreases with distance from the wire</p> Signup and view all the answers

    What is the principle behind self-induction?

    <p>A changing magnetic field induces a voltage along the same wire</p> Signup and view all the answers

    What is the formula for the induced emf in a loop?

    <p>E = -N Δφ / Δt</p> Signup and view all the answers

    When visualizing the magnetic field from the side, what do the circles representing the magnetic field lines appear to do?

    <p>They appear to come out of the page on one side and go into the page on the other side</p> Signup and view all the answers

    What happens to the magnetic flux when a south pole of a magnet moves away from a loop?

    <p>The magnetic flux decreases</p> Signup and view all the answers

    What is the orientation of the magnetic field lines produced by a current-carrying wire?

    <p>They are perpendicular to the direction of the current flow</p> Signup and view all the answers

    What is the purpose of the Right Hand Rule in determining the direction of the magnetic field?

    <p>To determine the orientation of the magnetic field lines</p> Signup and view all the answers

    What is the direction of the induced current in a solenoid?

    <p>The current flows in a direction that opposes the change in magnetic flux</p> Signup and view all the answers

    What happens to the magnetic field lines when the current through the wire increases?

    <p>The magnetic field lines become stronger and denser</p> Signup and view all the answers

    What is the shape of the magnetic field lines around a current-carrying wire when viewed from above?

    <p>Concentric circles</p> Signup and view all the answers

    What is the symbol used to represent an arrow coming out of the page when visualizing magnetic fields?

    <p>( \odot )</p> Signup and view all the answers

    Which of the following does not describe the magnetic field around a straight wire?

    <p>Magnetic field lines that are parallel to the wire</p> Signup and view all the answers

    What is the characteristic of the magnetic field inside a solenoid?

    <p>Uniform and strong</p> Signup and view all the answers

    What is the purpose of markers installed on power lines?

    <p>To make the power lines more visible to birds</p> Signup and view all the answers

    What is the condition for a magnetic field to induce a voltage in a wire?

    <p>The magnetic field must be changing</p> Signup and view all the answers

    What is the formula for magnetic flux through a loop of area A in the presence of a uniform magnetic field B?

    <p>φ = BA cos θ</p> Signup and view all the answers

    What is the direction of the magnetic field lines emerging from a loop of wire according to the Right Hand Rule?

    <p>In the direction of the thumb</p> Signup and view all the answers

    What is the primary purpose of electromagnets?

    <p>To maximize the magnetic field strength</p> Signup and view all the answers

    What is the relationship between the magnetic field strength and the current in a wire?

    <p>The magnetic field strength is directly proportional to the current</p> Signup and view all the answers

    What is the significance of Faraday's Law of Electromagnetic Induction?

    <p>It describes how a changing magnetic field induces a voltage</p> Signup and view all the answers

    What is the effect of a magnetic field parallel to the surface of a loop on the magnetic flux?

    <p>It has no effect on the magnetic flux</p> Signup and view all the answers

    What is the primary reason for the magnetic field lines being denser inside a loop of wire?

    <p>The magnetic field lines converge through the loop</p> Signup and view all the answers

    What is the effect of increasing the number of turns in a solenoid on the magnetic field strength?

    <p>The magnetic field strength increases proportionally to the number of turns</p> Signup and view all the answers

    What is the purpose of studying the magnetic flux through a loop?

    <p>To understand the principle of electromagnetic induction</p> Signup and view all the answers

    What happens to the magnetic field around a wire when the direction of the current flow changes?

    <p>The magnetic field direction reverses</p> Signup and view all the answers

    What is the primary concern regarding power lines and their impact on the environment?

    <p>The power lines are a threat to certain bird species</p> Signup and view all the answers

    What is the condition required for a changing magnetic field to induce a voltage in a wire?

    <p>The magnetic field must be changing</p> Signup and view all the answers

    What is the purpose of the Right Hand Rule in relation to electromagnetic induction?

    <p>To determine the direction of the induced emf</p> Signup and view all the answers

    What is the relationship between the magnetic flux and the area of the loop?

    <p>The magnetic flux is directly proportional to the area of the loop</p> Signup and view all the answers

    What is the primary application of electromagnetic induction in electrical systems?

    <p>Generation of electricity</p> Signup and view all the answers

    What is the effect of increasing the distance from the wire on the magnetic field strength?

    <p>The magnetic field strength decreases</p> Signup and view all the answers

    What is the reason for the deflection of a compass needle when placed near a current-carrying wire?

    <p>The magnetic field lines are perpendicular to the direction of the current flow.</p> Signup and view all the answers

    What is the orientation of the magnetic field lines when viewing the current-carrying wire from above?

    <p>Concentric circles around the wire.</p> Signup and view all the answers

    What is the relationship between the strength of the magnetic field and the distance from the wire?

    <p>The strength of the magnetic field decreases as the distance from the wire increases.</p> Signup and view all the answers

    What is the purpose of the Right Hand Rule in determining the direction of the magnetic field?

    <p>To determine the direction of the magnetic field.</p> Signup and view all the answers

    What happens to the magnetic field lines when the current through the wire increases?

    <p>The magnetic field lines become stronger.</p> Signup and view all the answers

    What is the symbol used to represent an arrow going into the page when visualizing magnetic fields?

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

    What is the shape of the magnetic field lines when viewed from the side?

    <p>Edge-on circles.</p> Signup and view all the answers

    What is the relationship between the magnetic field strength and the current in a wire?

    <p>The magnetic field strength is proportional to the current.</p> Signup and view all the answers

    What is the proportionality constant between the induced emf and the rate of change of magnetic flux in Faraday's Law of Electromagnetic Induction?

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

    What is the purpose of the minus sign in Faraday's Law of Electromagnetic Induction?

    <p>To indicate the opposition to the change in magnetic flux</p> Signup and view all the answers

    What is the effect on the induced current in a solenoid when the south pole of a magnet moves away from the solenoid?

    <p>The induced current direction changes</p> Signup and view all the answers

    What is the principle behind the generation of electrical energy in a generator?

    <p>Faraday's Law of Electromagnetic Induction</p> Signup and view all the answers

    What is the direction of the induced current in a loop when a north pole of a magnet approaches the loop?

    <p>Opposite to the magnetic field</p> Signup and view all the answers

    What is the effect on the magnetic flux when a coil is rotated in a uniform magnetic field?

    <p>The magnetic flux changes sinusoidally</p> Signup and view all the answers

    What is the relationship between the number of turns in a loop and the induced emf?

    <p>The induced emf is proportional to the number of turns</p> Signup and view all the answers

    What is the purpose of Lenz's Law in electromagnetic induction?

    <p>To ensure the direction of the induced current opposes the change in magnetic flux</p> Signup and view all the answers

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