Equivalent inductance of fixed coil & moving coil

Q.  The equivalent inductance of fixed coil and moving coil of electrodynamic instrument is given by
- Published on 14 Sep 15

a. L1 + L2 + 2M
b. L1 + L2 - 2M
c. L1 + L2 + M
d. L1 + L2 - M

ANSWER: L1 + L2 + 2M

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