A wire is bent in the form of an equilateral triangle of side $100 \,cm$ and carries a current of $2 \,A$. It is placed in a magnetic field of induction $2.0 \,T$ directed perpendicular into the plane of paper. The direction and magnitude of magnetic force acting on each side of the triangle will be
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(c)
$\vec{F} =i(\vec{i} \times \vec{B})$
$=2(1)(2)$
$=4\,N$
Normal to side towards centre of triangle.
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