The coefficient of coupling in Problem is increased to 1.0.a) If i1 equals 6 A, what value...

The coefficient of coupling in Problem is increased to 1.0.

a) If i1 equals 6 A, what value of i2 results in zero stored energy?

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b) Is there any physically realizable value of i2 that can make the stored energy negative?

Problem

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.