O-LevelPhysicsMagnetism5054/11 · Oct/Nov 2013 · Q331 Mark
The graph shows the output of an a.c. generator. The coil in the generator rotates 20 times in one second. The speed of rotation of the coil steadily increases. Which graph best shows how the output changes?
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Agraph showing an output p.d./V that is a sinusoidal wave with constant amplitude of 1 V and an increasing frequency over time.
Bgraph showing an output p.d./V that is a non-sinusoidal wave with constant amplitude of 1 V and an increasing frequency over time, with an irregular shape.
Cgraph showing an output p.d./V that is a sinusoidal wave with increasing amplitude to 2 V and constant frequency over time.
Dgraph showing an output p.d./V that is a sinusoidal wave with increasing amplitude to 2 V and an increasing frequency over time.
✓ Correct answer
D: graph showing an output p.d./V that is a sinusoidal wave with increasing amplitude to 2 V and an increasing frequency over time.
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