A flat circular coil of 20 turns has a radius of 8.0cm and carries a current of 4.0A.
(a) Find the magnitude of the magnetic field at its centre.
(b) Determine the magnetic flux linked with the coil.
(c) The current in the coil is reversed in direction in 0.010s. Calculate the average magnitude of the induced emf in the coil during this interval. Assume the field external to the coil is negligible.