Q137 · Practice questionComplex familiar5 marks
QUESTION 137 (5 marks)
A -turn square coil of side is initially perpendicular to a magnetic field directed into the page. The field falls uniformly to in .
a)[3 marks]
Calculate the magnitude of the average induced .
b)[2 marks]
State the direction of the induced magnetic field and explain the energy transfer.
WORKED SOLUTION
5 marksPractice marking scheme
ANSWER
The induced field is into the page, the same direction as the original field, because the original inward flux is decreasing. Energy associated with changing the external field is converted to electrical/thermal energy in the circuit, consistent with Lenz’s law.
Worked solution
Part (a): . .
Part (b): The induced field is into the page, the same direction as the original field, because the original inward flux is decreasing. Energy associated with changing the external field is converted to electrical/thermal energy in the circuit, consistent with Lenz’s law.
Part (a): completes the requested reasoning and obtains a correct result.
Part (b): completes the requested reasoning and obtains a correct result.
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