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Two coils X and Y are placed in a circui...

Two coils X and Y are placed in a circuit such that a current changes by 3 ampere in coil X and the magnetic flux changes of 1.2 weber occurs in Y. The value of mutual inductance of the coils is :

A

0.2 henry

B

0.4 henry

C

0.6 henry

D

3.6 henry.

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