Question

An ac generator consists of a coil of 200 turns, 100 cm in diameter. If the coil rotates at 500 rpm in a magnetic field of 0.25T, then the maximum induced emf

• A. 20.6 V
• B. 51.7 V
• C. 4.1 V
• D. None of the above

Answer 1

Answer: (D)

None of the above

$emf=$ rate of change of flux

$=N\times area\times B\times \omega$

$=200\times \pi {0.5}^2\times 0.25\times 500\times 2\pi /60$

$=2056.17V$