Electromagnetic induction Quiz
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5 questions, one answer each
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1. A coil of 100 turns has its flux linkage changed from 0.020 Wb turns to 0.080 Wb turns in 0.050 s. What is the magnitude of the induced e.m.f.?
- A. 1.2 V
- B. 0.60 V
- C. 6.0 V
- D. 120 V
2. Which statement about Lenz's law is correct?
- A. The induced e.m.f. is proportional to the flux linkage
- B. The induced current helps the change that causes it
- C. The induced current opposes the change that causes it
- D. The induced e.m.f. is zero when the flux is changing
3. A magnet is dropped through a coil joined by a wire into a closed circuit. Compared with free fall the magnet's acceleration is
- A. greater than g
- B. equal to g
- C. zero throughout
- D. less than g while it is in the coil
4. Which change would NOT increase the e.m.f. induced when a magnet is moved into a coil?
- A. Using a coil with more turns
- B. Moving the magnet faster
- C. Using a stronger magnet
- D. Reversing the poles of the magnet
5. A steady direct current flows in the primary coil of two linked coils. The e.m.f. in the secondary is
- A. zero, because the flux is not changing
- B. maximum, because the flux is largest
- C. equal to the e.m.f. of the supply
- D. constant and non-zero