IB Physics HL D 4 6 Hl Rotation Frequency and Emf Questions

Analyse how generator rotation frequency changes HL alternating-emf graphs, scaling peak and rms voltage, frequency, period and output-power waveforms.

Exam points

Relate generator rotation speed and frequency to peak and rms emf.
Predict how doubling rotational frequency changes period, amplitude and output graphs.
Interpret alternating-current generator voltage and power waveforms.

[Maximum number: 2]

A rod, R , lies perpendicular to a uniform magnetic field B of strength 0.50 T directed into the plane of the page. R is connected to a circuit and the electric current $I_{\mathrm{R}}$ is 2.0 A .

The coil is made to rotate such that an emf is induced. The graph shows the variation with time of the emf induced in the coil.

Figure for Question IB Physics HL D 4 6 Hl Rotation Frequency and Emf Questions question 1 — IB Physics HL

The frequency of rotation is doubled. Draw on the graph the variation with time of the new emf induced.

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IB Physics HL D 4 6 Hl Rotation Frequency and Emf Questions question 1