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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.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • relate generator rotation speed to angular frequency, output frequency and period, including the effects of doubling or reducing the rotation rate
  • calculate and compare peak or rms induced emf when rotation speed changes, using the proportional dependence of emf on angular speed
  • interpret and sketch generator voltage or power graphs after a frequency change, showing the changed amplitude, period and number of cycles correctly

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Study D.4.6 (HL)—Rotation frequency and emf conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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

[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 IRI_{\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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