A bar magnet is suspended from a spring. One pole of the magnet oscillates freely in a coil of wire, as shown in Fig. 7.1. The switch $$\(S\)$$ is initially open. The procedure in (a) is repeated after replacing the resistor with one of greater resistance. Suggest, with a reason, the effect of this change on the oscillations. . .
Exam No：9702_s25_qp_44 Year：2025 Question No：7(b)
Answer:
Knowledge points:
17.3.1 describe practical examples of damped oscillations with particular reference to the effects of the degree of damping and the importance of critical damping
17.3.2 describe practical examples of forced oscillations and resonance
17.3.3 describe graphically how the amplitude of a forced oscillation changes with frequency near to the natural frequency of the system, and understand qualitatively the factors that determine the frequency response and sharpness of the resonance
17.3.4 appreciate that there are some circumstances in which resonance is useful and other circumstances in which resonance should be avoided
20.5 Electromagnetic induction
Solution:
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