A square loop of side 1 m is placed in a perpendicular magnetic field. Half of the area of the loop is inside the magnetic field. A battery of emf 10 V and negligible internal resistance is connected in the loop. The magnetic field changes with time according to relation 
. The resultant emf in the loop will be
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Given 
,
Induced emf 
Since magnetic field ( × × ) decreasing so according to Lenz's law direction of induced current in upper part of square will be clockwise i.e. from A to C or in other words emf induces in a direction opposite to the main emf so resultant emf 
.
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