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A square loop of side a hangs from an in...

A square loop of side a hangs from an insulating hanger of spring balance. The magnetic field of strength `B` occurs only at the lower edge. It carries a current `I` . Find the change in the reading of the spring balance if the direction of current is reversed.

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Initially `F_1 = mg + Ia B` (down wards)
when the direction of current is reversed
`F_2 = mg - IaB ` (down wards) ` rArr Delta F = 2IaB`
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