Question

In the next three questions, predict whether moving the bar magnet through the loop faster or slower generates a higher magnitude emf:

1) When you change the speed that the bar magnet moves through the loop, what variable are you changing? (B= “B”, A= “A”)

1. N

2. ∆t

3. B

4. A

5. Theta

2) If you move the bar magnet faster, does that variable increase or decrease?

3) Which situation generates a higher magnitude emf?

a) Moving the magnet faster

b) Moving the magnet slower

Answer 1

1. With change in speed of the bar magnet, we change the rate of change of magnetic flux inside the loop.

2. If we move the bar magnet faster than the variable will increase due to increase in rate of change of magnetic flux.

3. A will be correct as the Faraday's law states that the EMF is directly proportional to the rate of change of magnetic flux and the faster the magnet moves the more rate of change of magnetic flux will be there.