The magnetic field existing in a region is given by $B = 0.2 (1 + 2 x) \hat{k} T$ . A square loop of edge $50 cm$ carrying 0.5 A current is placed in $x - y$ plane with its edges parallel to the $x - y$ axes, as shown in figure. The magnitude of the net magnetic force experienced by the loop is_____ $mN$ .

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Force on segment parallel to x -axis will cancel each other. Hence F net ​ will be due to portion parallel to y -axis. ​ F = 0.5 × 0.5 × 6 × 0.2 − 0.5 × 0.5 × 0.2 × 5 = 0.5 × 0.5 × 0.2 = 0.25 × 0.2 = 50 × 1 0 − 3 N = 50 mN ​

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