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Magnetic fields (A-level only)

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Question 9

A steady direct current of intensity I I\,I passes through a calibration resistor of resistance RRR, dissipating a power PPP. An alternating current with a peak current of 3I 3I\,3I is passed through a heating element of resistance R2\displaystyle \frac{R}{2}2R​.

What is the mean power dissipated in the heating element?

A

4.5P4.5 P4.5P

B

2.25P2.25 P2.25P

C

1.125P1.125 P1.125P

D

9P9 P9P

Markscheme

Magnetic fields (A-level only) Questions

  1. A Level
  2. /Physics
  3. /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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