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A pair of the adjacent coil has a mutual inductance of 1.5 H. If the current in one coil varies from 0 to 20 A in 0.5 s, what is the change of flux linked with the other coil.

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#### Solution

Given: M = 1.5 H, I_{1} = 0 A, I_{2} = 20 A

dI = I_{2} - I_{1}

= 20 - 0 = 20 A

dt = 0.5 sec

Change of flux linked with the other coil,

dΦ = MdI

= 1.5 × 20

= 30 Wb

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