Question

In a region of uniform magnetic inductance `B=10^(-2)`tesla. A circular coil of radius `30 cm` and resistance `pi^(2) ohm` is rotated about an axis which is perpendicular to the direction of `B` and which forms a dimater of the coil. If the coil rotates at `200` r.p.m the amplitude of the alternatic current induced in the coil is
A. `4pi^(2)mA`
B. `30 mA`
C. `6 mA`
D. `200 mA`

Answer 1

Correct Answer - C
Amplication of `ac=i_(0)=(V_(0))/R=(omegaNBA)/R=((2piv)NB(pir^(2)))/R`
`implies i_(0)=(2pixx200/60xx1xx10^(-2)xxpixx(0.3)^(2))/(pi^(2))=6mA`