Give the expression for maximum induced emf in an ac generator.

Explanation

Let the call be rotating with angular velocity at any instant .t. when the normal to the plane of the coil makes an angle `theta` with the magnetic field. Hence magnetic flux,
`phi = NBA cos omega t`, There for induced emf `(epsilon)`
`epsilon = -(d phi)/(d t)`
`rArr epsilon = NBA omega sin omega t`
Induced emf will be maximum when `omega t = 90^(@)`
Hence, `epsilon_(max) = NBA omega`
Direction of induced emf can be determined using Flemming.s right hand rule.
[Alternatively : Statement of the above rule.]