how is induced current in a secondary coil related to current in primary coil
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The primary coil current produces a magnetic field, which changes as the current changes. The iron core increases the strength of the magnetic field. The magnetic field passes through (or cuts) the secondary coil. The changing magnetic field induces a changing potential difference in the secondary coil.
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The induced current in a secondary coil is related to current in primary coil as the magnetic field in some of the coil is shared with another coil due to which current is induced
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