Question

A rectangular coil 30cm long and 20cm wide has 250 turns. It rotates at the uniform rate of 3000 rev/minute about an axis parallel to its long side and at right angles to a uniform magnetic field of flux density 5×10-2T find the frequency of revolution A60Hz B3000Hz C100Hz D50Hz?

Answer 1

To find the frequency of revolution, we need to convert the given rate of rotation in revolutions per minute into Hertz.

1 revolution/minute = 1/60 Hz

Therefore, 3000 revolutions/minute = 3000/60 Hz = 50 Hz

So, the frequency of revolution is D50Hz.