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A metal wire of linear mass density of 9...

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

A

25 Hz

B

50 Hz

C

100 Hz

D

200 Hz

Text Solution

Verified by Experts

The correct Answer is:
B
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