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Two coils are fixed in space at some distance from each other such that there is a flux linkage between them. When coil 1 has no current and the current in the coil 2 increases at the rate 15 . 0 A s - 1 , the emf in the coil 1 is 25 . 0 mV . When coil 2 has a current of 3 . 6 A , the flux linkage in coil 2 (in mWb ) is

Correct answer

6

Step-by-step solution

As e = M d i d t ∴ M = e d i / d t = 25 × 10 - 3 15.0 = 1.67 × 10 - 3 H As ϕ = M i ∴ ϕ = 1.67 × 10 - 3 × 3.6 = 6 × 10 - 3 Wb = 6 mWb

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