The self-inductances of the coils in Fig. 6.30 are L1 = 18 mH and L2 = 32 mH. If the coeff...

The self-inductances of the coils in Fig. 6.30 are L1 = 18 mH and L2 = 32 mH. If the coefficient of coupling is 0.85, calculate the energy stored in the system in millijoules when (a) i1 = 6 A, i2 = 9 A; (b) i1 = −6 A, i2 = -9 A; (c) i1 = 6 A, i2 = 9 A; and (d) i1 = 6 A, i2 = −9A.