O-LevelPhysicsMagnetism5054/11 · Oct/Nov 2012 · Q361 Mark

A simple a.c. generator produces an alternating e.m.f. as shown. The speed of the generator is doubled. Which graph best represents the new output?

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Agraph of e.m.f./V vs time/s. A sinusoidal waveform with amplitude 1.0 V and period 1.0 s.

Bgraph of e.m.f./V vs time/s. A sinusoidal waveform with amplitude 2.0 V and period 1.0 s.

Cgraph of e.m.f./V vs time/s. A sinusoidal waveform with amplitude 1.0 V and period 0.5 s.

Dgraph of e.m.f./V vs time/s. A sinusoidal waveform with amplitude 2.0 V and period 0.5 s.

✓ Correct answer

D: graph of e.m.f./V vs time/s. A sinusoidal waveform with amplitude 2.0 V and period 0.5 s.

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