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A metal wire of linear mass density of 9.8 g/m is streched with a tension of 10 kg-wt between two rigid supports 1 m 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 :


( A ) 25 Hz
( B ) 200 Hz
( C ) 50 Hz
( D ) 100 Hz

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