Faraday's Law — Practice Quiz

Question 1

A 100-turn coil has its flux change from 0.05 Wb to 0.01 Wb in 0.02 s. EMF induced is:

Accepted Answer

200 V

Answer

100 V

Answer

2000 V

Answer

20 V

Question 2

Doubling the rotation speed of a generator coil doubles:

Accepted Answer

Both frequency and peak EMF

Answer

Frequency only

Answer

Peak EMF only

Answer

Neither

Question 3

A magnet falls through a vertical copper pipe. It slows because of:

Accepted Answer

Induced currents in the pipe creating opposing B

Answer

Air resistance

Answer

Gravity reverses near copper

Answer

Magnetic monopoles

Question 4

Flux through a coil is Φ(t) = 3t² + 4t. EMF at t = 2 s is:

Accepted Answer

16 V

Answer

12 V

Answer

20 V

Answer

4 V

Question 5

Faraday's law applies to:

Accepted Answer

Any situation where flux changes

Answer

DC circuits only

Answer

Static field only

Answer

Conducting media only

Question 6

A 50-turn coil of area 100 cm² rotates at 60 Hz in B = 0.5 T. Peak EMF is:

Accepted Answer

94 V

Answer

9.4 V

Answer

0.94 V

Answer

47 V