A circular coil of radius is in a magnetic field increasing at perpendicular to the coil. What is the induced EMF?
Answer and explanation
Correct answer: D.
- Step 1: Coil area: .
- Step 2: Rate of flux change: .
- Step 3: Faraday's law: .
Answer
3.14 V.
Why not the others: '' uses diameter instead of radius; '' uses 25 turns; '' misses a factor of 10.
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