Physics 9702 · AS & A Level · Damped and forced oscillations, resonance

Damped and forced oscillations, resonance — practice question

A bar magnet hangs from a spring. As shown in Fig. 7.1, one pole of the magnet swings freely inside a coil of wire. The switch $S$ is open at the start.
(a(i))[2]

State what damping means.

(a(ii))[1]

Describe the observation that shows the damping is light.

(a(iii))[3]

Using electromagnetic induction and conservation of energy, explain why the oscillations are damped.

(b)[2]

The method in (a) is repeated after the resistor is replaced by one with a larger resistance. Suggest, with a reason, what effect this has on the oscillations.

Worked solution & mark scheme

This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “loss of energy from oscillations” …

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