A square coil of side 0.5 m has movable ...

A square coil of side 0.5 m has movable sides. It is placed such that its plane is perpendicular to uniform magnetic field of induction 0.2 T. If all the sides are allowed to move with a speed of 0.1 `ms^(-1)` for 4 sec outwards, average induced emf is

Zero

0.01V

0.028V

0.072V

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