Practice Electromagnetic Induction in Physics
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
The production of voltage (EMF) in a conductor when the magnetic flux through it changes.
Push a magnet into a coil and current flows — the changing magnetic field 'induces' electricity. Pull it out and current flows the other way.
Example 1
easyA single loop of wire with area 0.05 \text{ m}^2 is in a magnetic field that changes from 0.8 \text{ T} to 0.2 \text{ T} in 0.3 \text{ s}. What is the induced EMF?
Example 2
mediumA coil with 200 turns and area 0.02 \text{ m}^2 is rotated from perpendicular to parallel to a 0.5 \text{ T} magnetic field in 0.1 \text{ s}. What is the average induced EMF?
Example 3
mediumA bar magnet is pushed into a coil of 100 turns, increasing the flux through each turn from 0 to 0.004 \text{ Wb} in 0.2 \text{ s}. What is the induced EMF? If the coil has resistance 5 \text{ } \Omega, what current flows?
Example 4
hardA rectangular loop (0.1 \text{ m} \times 0.2 \text{ m}) moves at 5 \text{ m/s} into a region with a uniform 0.3 \text{ T} magnetic field. What EMF is induced as the loop enters the field?