Question

The number of turns in the coil of an ac­ generator is 5000 and the area of the coil is
$0.25m^2$. The coil is rotated at the rate of 100 cycles/sec in a magnetic field of 0.2 W/$m^2$. The peak value of the emf generated is nearly

• A. 786 kV
• B. 440 kV
• C. 220 kV
• D. 157.1 kV

Answer 1

The correct option is D 157.1 kV

$e_0=wNBA=\left(2\pi v\right)$ NBA
$=2\times 3.14\times 100\times 5000\times 0.2\times 0.25=157$ kV.