Coil 1 has `L_(1)` = 25 mH and `N_(1)` = 100 turns. Coil 2, has `L_(2)`= 40 mH and `N_(2)` = 200 turns. The coils are fixed in place, their mutual inductance M is 9.0 mH. A 6.0 mA current in coil 1 is changing at the rate of 4.0 A/s. (a) What magnetic flux `phi_(12)` 12 links coil 1, and (b) what self-induced emf appears in that coil? (c) What magnetic flux `phi_(21)` links coil 2, and (d) what mutually induced emf appears in that coil?

Explanation

(a) 1.5 μWb, (b) `10 xx 10^(2) mV`, (c) 90Wb, (d) 12 mV