A solenoid has a coil C of wire wound tightly about its centre. The coil C has 96 turns. The uniform magnetic flux Φ, in Wb, in the solenoid is given by the expression Φ = 6.8 × 10⁻⁶ × I, where I is the current, in A, in the solenoid.

Calculate the average electromotive force (e.m.f.) induced in coil C when a current of 3.5 A is reversed in the solenoid in a time of 2.4 ms.