Practice Problems

1. A coil with 30 turns and area 0.02 m² is in a magnetic field increasing at 0.6 T/s. Calculate the induced emf.
2. A magnet is moved towards a loop. Determine the direction of the induced current using Lenz’s Law.
3. A rotating coil in a generator has maximum emf of 5 V. If the coil has 50 turns and area 0.03 m², find the angular speed of rotation.
4. Explain why increasing the number of turns in a coil increases the induced emf.
5. A solenoid has 100 turns and a flux change of 0.1 Wb in 0.2 s. Calculate the average emf.
6. Sketch the induced current in a loop as a magnet is pulled out at constant speed.
7. Compare the induced emf for two coils: one with double the area and the same flux change rate.
8. Explain how electromagnetic induction is applied in household transformers.