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An insulated copper wire is wound on a soft iron core. Current is passed through the coil such that at end ‘A’ the current flows anti- clockwise and a magnetic compass needle placed at other end ‘B’ of the coil. i) If soft iron core is replaced by a cardboard tube, what will be the effect on the magnetic needle? ii) What happens to the magnetic needle if the current is stopped? |
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Answer» An insulated copper wire is wound on a soft iron core. Current is passed through the coil such that at end ‘A’ the current flows anti- clockwise and a magnetic compass needle placed at other end ‘B’ of the coil. i) If soft iron core is replaced by a cardboard tube, what will be the effect on the magnetic needle? ii) What happens to the magnetic needle if the current is stopped? |
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