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A small magnet is along the axis of a co...

A small magnet is along the axis of a coil and its distance from the coil is 80cm .In this position the flux linked with the coil is `4 times10^(-5)`weber.If the coil is displaced `40cm` towards the magnet in`0.08s` then the induced emf produced in the coil will be
1)0.5 mV
2)1mV
3)7mV
4)-3.5mV

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