Physics - EMI/AC Question with Solution | TestHub

A metal wire of linear mass density of $9.8\mathrm{g}/\mathrm{m}$ is stretched with a tension of $10\mathrm{kg}$-wt between two rigid supports 1 metre apart. The wire passes at its middle point between the poles of a permanent magnet, and it vibrates in resonance when carrying an alternating current of frequency $n$. The frequency $n$ of the alternating source is