The coefficient of mutual inductance of two circuits A and B is 3 mH and their respective resistances are 100 hm and 4 ohm. How much should the currents change, in 0.02 second, in circuit A, so that an induced current 0.006 ampere flows through the circuit B?
(1) 0.16 A
(2) 0.18 A
(3) 0.24 A
(4) 1.6 A
