A semicircular wire PQS of radius R is connected to a wire bent in the form of a sine curve to form a closedloop as shown in the figure. If the loop carries a current i and is placed in a uniform magnetic field B, thenthe total force acting on the sine curve is(1) 2BIR (downward)3) BIR (upward)(2) 2BIR (upward(4) Zero

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