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Electromagnetism — Question 261

Original QCE Vault practice · 4 marks

Q261 · Practice questionComplex familiar4 marks

QUESTION 261 (4 marks)

A 200200-turn generator coil has area 5.00×10−3 m25.00\times10^{-3}\,\mathrm{m^2} per turn in a uniform 0.300 T0.300\,\mathrm T field. It rotates uniformly. In 0.0500 s0.0500\,\mathrm s, the angle between its area normal and the field changes from 0∘0^\circ to 90.0∘90.0^\circ.
a)
Calculate the magnitude of the average induced EMF over this quarter turn.
[2 marks]
b)
Explain why the EMF changes sign between the first half turn (0∘0^\circ to 180∘180^\circ) and the second half turn (180∘180^\circ to 360∘360^\circ).
[2 marks]
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