Equivalent inductance of fixed & moving coil of electrodynamic instrument

Q.  The equivalent inductance of fixed coil and moving coil of electrodynamic instrument is given by
- Published on 05 Nov 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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