If an oscillation copper disc is placed in a magnetic field, then

The frequency of oscillations is decreasing continuously.

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The frequency of oscillations is increasing continuously.

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The frequency of oscillations is constant.

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None of these.

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Solution

The correct option is C The frequency of oscillations is constant.
If an oscillating copper disc is placed in a magnetic field, then an eddy current is produced in it (as a result of Faradays and Lenz law). Eddy current can produce significant drag, called magnetic damping.
It is tempting to say that the period decreases as the amplitude decreases, since the oscillating object has less distance to travel in one cycle. The damping force however reduces the speed to exactly counteract this effect. Thus the period and frequency of a dumped oscillator are constant throughout its motion.

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