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Answer the following: (a) Define mutua...

Answer the following:
(a) Define mutual inductance and write its S.I. unit.
(b) A square loop of side `a` carrying a current `I_(2)` is kept at distance `x` from an infinitely long straight wire carrying a current `I_(1)` as shown in the figure. Obtain the expression for the resultant force on the loop.

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