The emf produced in a generator is Vemf = 25 sin 377t. What is the frequency of rotation of the circular coil?

50 Hz

60 Hz

25 Hz

15 HZ

The emf produced in a generator is:

Vemf=25sin (377t)

Recall the standard equation which describes relation between amplitude and angular velocity.

V=asin (ωt)

so substitute the numbers into the equation

Vemf=25sin (377)

to find frequency use the equation

f=w/2π

so freq = 377/2π

this will equal 60Hz