Suppose a circular coil is placed in a uniform magnetic field B. Which of the following creates the emf of the largest magnitude?
a. Doubling the field value from B to 2B in 2.0 s.
b. Keeping the field at value B and rotating the coil so that the normal to the coil's loop area rotates 360o relative to the field direction (i.e., one complete revolution) in 2.0 s.
c. Keeping the direction of the field parallel to the normal to the area of the coil and decreasing the field uniformly from B to zero in 2.0 s.