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A short-circuited coil is placed in a time-varying magnetic field. Electrical power is dissipated due to the current induced in the coil. If the number of tums were to be quadrupled and the wire radius halved, the electric power dissipated would be
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Correct option is B
Here N2=4N1 so e2=4e1 New length l2=4l1Because the radius of the wire is halved and hence the area becomes one-fourth, i.e.,A2=A14 or R2=16R1∴ Power P2=e22R2=4e1216R1=e12R1=P1Similar Questions
A circular ring, made of copper wire, has area of 30 cm2 and resistance of 10 . It is placed in a uniform magnetic field of induction 2 tesla with its plane perpendicular to the field. When the loop is rotated through an angle of about its diameter, coulomb of charge flows through it. Then is
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