why is the earth inductor called so ?
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The earth inductor is called so because an induced e.m.f. is induced in it due to change in magnetic flux linked with the coil due to its eath's magnetic field .
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The earth inductor consists of a circular coil that can be rapidly rotated about an axis lying along a diameter of the coil. ... If the axis does not lie along the direction of the earth's magnetic field, then when the coil is being rotated, an alternating current is produced which is indicated by the galvanometer
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