G is a sensitive galvanometer connected to coil2. Coil 1 is insulated from coil 2. Both coils are wound on the same iron core and are insulated from it. When the variable contact on the rheostat is moved half way to the left, the needle on the galvanometer

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G is a sensitive galvanometer connected to coil2. Coil 1 is insulated from coil 2. Both coils are wound on the same iron core and are insulated from it. When the variable contact on the rheostat is moved half way to the left, the needle on the galvanometer