In a.c. generator, which rule determines the direction of induced emf?

state the rule to determine the direction of a current induced in a coil due to its rotation in a magnetic field.

State Lenz's rule to find direction of induced current.

A circular coil of N turns and radius R is kept normal to the magnetic field given by B = B_0 cos omegat . Deduce an expression for e.m.f. induced in the coil. State the rule which helps to detect the direction of induced current.

What is the basic cause of induced e.m.f.?