why isn't the answer zero?

Dear student,
We know, magnetic force acting on a current conducting wire can be expressed asF =i(L×B)where L = effective length =diameter of the semi circular part= 2Rangle between L and B =900F=iLB =i(2R)Bnow,L = Li and B =B(-k)so,L×B=(Li×B(-k)) = LB(-i×k) =LB j^henceF is in upward directionF= 2iRB (upwards)

Regards

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