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Magnetic fields (A-level only)

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Question 13

A geothermal exploration probe uses two different resistive heating systems to maintain its internal temperature:

System 1: A steady direct current $I$ is passed through a heating element of resistance $R$ , dissipating a power $P$ .
System 2: An alternating current with a peak value of $3 I$ is passed through a secondary heating element of resistance $0.4 R$ .

What is the average power dissipated by the secondary heating element in System 2?

A

$0.6 P$

B

$1.2 P$

C

$1.8 P$

D

$3.6 P$

Markscheme

Magnetic fields (A-level only) Questions

A Level
Physics
Magnetic fields (A-level only)

66 exam-style questions on AQA A Level Physics Magnetic fields (A-level only), covering Magnetic flux density (A-level only), Moving charges in a magnetic field (A-level only), Magnetic flux and flux linkage (A-level only), Electromagnetic induction (A-level only), Alternating currents (A-level only), and The operation of a transformer (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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