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[" A metal wire of linear mass density o...

[" A metal wire of linear mass density of "9.8g/m" is stretched with a tension of "10kg" -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 atternating current of frequency "n" .The frequency nof the "],[" alternating source is: "],[[" (1) "50Hz," (2) "100Hz," (3) "200Hz," (4) "25Hz]]

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