The coefficient of mutual induction is 2 H and induced e.m.f. across secondary is 2 kV . Current in the primary is reduced from 6 A to 3 A . The time required for the change of current is

Step-by-step solution

Using the formula for induced electromotive force, = M I t , with mutual inductance M = 2 H , e.m.f. = 2000 V , and current change I = 3 A , we solve for the time interval: t = M I = 2 3 2000 Simplifying gives t = 0.003 s or 3 10⁻³ s , which corresponds to option D .