Two coils are placed close together in a physics lab to demonstrate Faraday's law of induction. A current of 7.5 A in one is switched off in 1.75 ms, inducing an average 11 V emf in the other. What is their mutual inductance?
a εave = 11 V, t = 1.75 ms, I = 7.5 A
b εave = 7.5 A, t = 11 V, I = 1.75 ms
c εave = 1.75 ms, t = 11 V, I = 7.5 A
d εave = 11 V, t = 7.5 A, I = 1.75 ms