A power line lies along the east-west direction and carries a current of $10\, ampere$. The force per metre due to the earth's magnetic field of ${10^{ - 4}}\,tesla$ is
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(c) Force on the wire = $Bil$
Force per unit length $ = Bi = {10^{ - 4}} \times 10 = {10^{ - 3}}\,N$
Force per unit length $ = Bi = {10^{ - 4}} \times 10 = {10^{ - 3}}\,N$
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