A wire carrying a current $i$ is placed in a uniform magnetic field in the form of the curve $y = a\sin \,\left( {\frac{{\pi x}}{L}} \right)\,0 \le x \le 2L.$ The force acting on the wire is
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(c) The given portion of the curved wire may be treated as a straight wire of length $2L$ which experiences a magnetic force ${F_m} = Bi(2L)$
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