The phase difference between the flux linkage and the induced e.m.f. in a rotating coil in a uniform magnetic field

Options

A. `pi//2`
B. `pi//3`
C. `-pi//6`
D. `pi`

Answer

A

Explanation

The flux is given bu
`phi=B.A`
`phi=|B"||"A|cos theta`
Also, induced emf, `epsilon=-(dphi)/(dt)=(d[|B||A|cos theta])/(dt)`
`=-|B||A|(d(costheta))/(dt)=|B||A|sintheta.omega`
`rArr" "epsilon=BAomegacos (theta-pi//2)`