Knock out the false induction claims

Exercise and reference answers

Questions

1. Question

   Three of these statements about inducing a current are false.

   Choices

   1. Item

      A magnet must move relative to the coil

      Correct

      Yes

   2. Explanation

      With no relative motion the flux never changes, so no emf appears.

      Item

      A still magnet in a coil induces one

   3. Explanation

      Lenz's law makes the induced current oppose the change, never help.

      Item

      Induced current adds to the flux change

   4. Explanation

      Changing the loop area or its angle induces a current just as well.

      Item

      Only a stronger magnet induces current

Instructions

Tap the three false statements about inducing a current to clear them from the board.

Explanation