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Lesson: Electromagnetic Induction

In this lesson, we will learn how to describe the electric current induced in a wire that is placed in a changing magnetic field.

Question Video: Understanding Lenz’s Law

04:60

Worksheet: Electromagnetic Induction • 8 Questions

Q1:

The direction of the current induced in a conductor by a changing is such that the magnetic field created by the induced current the initial changing magnetic field.

  • Amagnetic field, opposes
  • Belectric field, amplifies
  • Cmagnetic field, amplifies
  • Delectric field, opposes
  • Emagnetic field, is perpendicular to

Q2:

The diagram shows a permanent magnet being moved through a loop of copper wire. This motion induces an electric current of 0.5 A in the wire.

If the magnet is moved through the loop at half the speed, what will the current in the loop be?

  • ALess than 0.5 A
  • BGreater than 0.5 A
  • C 0 A
  • D 0.5 A

If the permanent magnet is changed for one that is twice as strong and moves through the loop at the original speed, what will the current in the loop be?

  • AGreater than 0.5 A
  • BLess than 0.5 A
  • C 0 A
  • D 0.5 A

Q3:

Diagram (a) shows a straight piece of copper wire moving along a rectangular path in a uniform magnetic field. Diagram (b) shows the potential difference across the piece of wire against time as it does so. Position in diagram a corresponds to the section marked in diagram (b).

Which section of diagram (b) does position in diagram (a) correspond to?

  • A
  • B
  • C
  • D

Which position in diagram (a) does section in diagram (b) correspond to?

  • A
  • B
  • C
  • D
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