1. Two coils 1 and 2 have self and mutual inductances of displacement V metres as under : L11 =2 + 3x,L22 =4 + 6x,L,2 = 2 - 3x. For constant I = 1A and It = -0.5A, an electromagnetic force is developed in the direction to increase x. The magnitude of the force is m, then (lO m +1/2)





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