SSC JE Electrical Engineering 23 Jan 2018 Morning Paper

Question : 128 of 200

Marks: +1, -0

What will be the value of coupling factor between two coils, when the self–inductance of each coil is 30 mH and the mutual inductance between them is 60 mH?

Validate

Solution:

Given data
k = ?

L_2 = L_1 = 30 mH

M = 60 mH
Now

M=k√{L_1L_2}

∴60=k√{30×30}

⇒k=60/30=2

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