Question
Two coils have mutual inductance of 1.5 henry. If current in primary circuit is raised to 5 ampere in one millisecond after closing the circuit, what is the e.m.f. induced in the secondary?
Solution
Given, raise in current of the primary circuit, dl = 5 ampere
Mutual inductance, M = 1.5 henry
Time, dt = 1 milli sec = 10–3 sec.
Using formula,
