SSC JE Electrical Engineering 2017 Set 3 Paper

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Question : 149 of 200

Marks: +1, -0

Two coupled coils of

L_1

= 0.8H and

L_2

= 0.2H have a coupling coefficient k = 0.9. The mutual inductance M is______

0.144 H
0.23 H
0.36 H
0.43 H

Solution:

L_1

= 0.8H,

L_2

= 0.2H
Coupling coefficient ‘K’ = 0.9
Now

K=M /√{L_1L_2}

∴

M =0.9 √{0.8 ×0.2} = 0.364

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