A metal wire of linear mass density of 9.8 gm–1 is stretched between two supports 1 m apart with a tension of 10 kg wt. The wire passes at its middle point between poles of a permanent magnet, and it vibrates in resonance when carrying an alternating current of frequency n. The frequency n of a.c. source is

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25 Hz

50 Hz

100 Hz

200 Hz

answer is B.

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