(a) The wire loop is shown, a square with 17 cm on a side, is rotated by an external torque at a constant angular velocity in a uniform magnetic field of 0.17 T. What is the maximum of the induced emf, if the loop makes a full turn every 0.24 s, in volts?
(b) The induced emf in the generator shown is zero at t = 0. What is the minimal time (in multiples of the period T, i.e. you solve for t/T) after which it has reached 15% of its maximum? Express your answer using two significant figures.
(c) A coil has Na turns enclosing an area of A. In a physics laboratory experiment, the coil is rotated during the time interval t from a position in which the plane of each turn is perpendicular to Earth's magnetic field to one in which the plane of each turn is parallel to the field. The magnitude of Earth's magnetic field at the lab location is B. What is the magnitude of the average emf induced in the coil?
