Lens\'s law states that current induced in a loop of wire when the magnetic flux

Question

Lens's law states that current induced in a loop of wire when the magnetic flux through the loop changes is always clockwise counterclockwise In such a direction as to oppose the change lit the original flux In the same direction as that of the current producing the original flux The cross-sectional area of un adjustable single loop is reduced from 1 m^2 to 0.25 m^2 in 0.1 s. What is the average cm f that is induced in this coil If It is in a region where B - 2 T upward, and the coil's plane is perpendicular to B 12 V 15 V 18 V 21 V

Explanation / Answer

part 12 )

by defination of lenz law .

in such a direction as to oppose the channge in the original flux ( C option )

part 13 )

e = -dphi/dt

phi = BA

e = BdA/dt

dA/dt = (0.25 - 1)/0.1

B = 2 T

e = 15 V ( b option )

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