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Magnetic fields (A-level only)

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Question 27

In a resistor of resistance $R$ , a steady current $I\,$ dissipates a power $P$ . In a resistor of resistance $R3\displaystyle \frac{R}{3}$ there is an alternating current of root mean square value $2 I$ . What is the mean power dissipated in the resistor of resistance $R3\displaystyle \frac{R}{3}$ ?

$4 P$

$43P\frac{4}{3}P$

$23P\frac{2}{3}P$

$49P\frac{4}{9}P$

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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