NEET Physics Waves Questions Solved

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 metre 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 

(1) 25 Hz

(2) 50 Hz

(3) 100 Hz

(4) 200 Hz

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