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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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(1) \( I a B \)
(2) \( 2 I a B \)
(3) \( \frac{I a B}{2} \)
(4) \( \frac{3}{2} I a B \)
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