A circular ring of radius a is made from a wire having resistance `(lambda)` per unit length. The ring is mounted on a car such that ring remains vertical. The care moves along a horizontal circle of radius R and completes n revolutions per minute. The horizontal component of earth's magnetic field be H,
The emf induced in the ring is

Options

A. `(pi^(2)a^(2)nH)/(10) cos ((pi nt)/(30))`
B. `(pi^(2)a^(2)nH)/(30) cos ((pi nt)/(30))`
C. `(pi^(2)a^(2)nH)/(10) sin ((pi nt)/(30))`
D. None of these

Answer

C