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??

Question

(a) $ 7.5 \times 10^{-3} V$
(b) $ 75 \times 10^{-3} V$
(c) $ 7.5 \times 10^3 V$
(d) $ 75 \times 10^3 V$