A metal wire of linear mass density of 9.8 g/m is stretched with a tension of 10 kg weight between two rigid supports 1 meter apart. The wire passes at its middle point between the poles of a permanent magnet, and it vibrates in resonance when carrying an alternating current of frequency n. The frequency n of the alternating source is
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Verified by ExpertsThe correct answer is:
B
In condition of resonance, frequency of a.c. will be equal to natural frequency of wire
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