Practice question · Estimate
A generator coil has 200 turns, area 0.05 m, and spins at 100 rad/s in a field of 0.20 T. Set the peak EMF, in volts.
Estimate on a scale from 0 V (0) to 500 V (500).
Hints
- Peak EMF for a rotating coil is the product of turns, field, area and angular speed.
- Compute 200 x 0.20 x 0.05 x 100.
Show the answer
200 (answers within ±20 count)
Why
V. The output is sinusoidal and its peak scales with all four factors, which is why generators are wound with many turns and spun fast.
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