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A mctal wire of linear mass density 9.8 /m is stretched with a tension of 10 kg wt between two rigid supports 1 metre apart. The wire passes at its middle point between the poles of a permanent magnet and it vibreates in resonance when carrying an alternating current of frequency n. the frequency n of alternating source is : |
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Answer» 50 Hz `rArrn = (1)/(2l) sqrt((T)/(m)) RARR = (1)/(2XX 1) sqrt((10xx 9.8)/(9.8 xx 10^(-3))) ` `rArr n = 50 `Hz Correct choice is (a) |
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