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A coil is wound on an iron core and loop...

A coil is wound on an iron core and looped back on itself so that the core has two sets of in opposite senses. How is its self inductance affected ?

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As two sets of closely wound wires carry currents in opposite sense, therefore, their induced effects cancel. The self inductance reduces. In a special case, we may have
`L_(equiv) = L_(1) + L_(2) - 2 M = L + L - 2 L = 0`
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