Electromagnetic Induction Quiz
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Questions and Answers

What is the main principle behind electromagnetic induction?

  • A magnetic field induces a current in a stationary coil.
  • A magnetic field always induces a current, regardless of its change.
  • A constant magnetic field induces a current in a coil.
  • A changing magnetic field induces a current in a coil. (correct)

    • In the experiment, what role does the galvanometer play?

  • It measures the magnetic field strength.
  • It changes the direction of the magnetic field.
  • It measures the induced current in the coil. (correct)
  • It generates the magnetic field.

    • Why does moving the north pole of the magnet into the coil induce a current?

  • The coil generates a resisting magnetic field.
  • The magnetic field strengthens inside the coil.
  • The relative motion causes a change in the magnetic field. (correct)
  • The north pole always generates current.

    • What would happen if you repeat the experiment with a coil having more turns?

    <p>The induced current would increase.</p> Signup and view all the answers

    What is the effect of using the south pole of the magnet instead of the north pole for the induction experiment?

    <p>The direction of the induced current would change.</p> Signup and view all the answers

    Why is it essential for the magnetic field to change with time in electromagnetic induction?

    <p>It induces a current according to Faraday's Law.</p> Signup and view all the answers

    Study Notes

    Electromagnetic Induction

    • The phenomenon of electromagnetic induction occurs when a circuit, such as a coil, is placed in a region where the magnetic field is changing with time.

    Conditions for Electromagnetic Induction

    • A changing magnetic field can induce a current in a circuit.
    • The magnetic field can change due to relative motion between a coil and a magnet placed near the coil.
    • A current-carrying conductor also produces a magnetic field that changes with a change in the current flowing through it.

    Experiment to Demonstrate Electromagnetic Induction

    • The experiment requires a magnetic bar, a galvanometer, a coil, and connecting wires.
    • Connect the coil to a galvanometer and observe the changes in the galvanometer needle when:
      • The north pole of a strong bar magnet is moved into the coil.
      • The south pole of the bar magnet is moved into the coil.
    • Repeat the procedure with coils having different numbers of turns to observe the variation in the deflection of the galvanometer needle.

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    Description

    Test your understanding of electromagnetic induction, a fundamental concept in physics where a changing magnetic field induces an electric current.

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