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Two coils of self inductance L1 and L2 are placed closer to each other so that total flux in one coil is completely linked with other. If M is mutual inductance between them, then

(1) M = L1 L2

(2) M = L1/L2

(3) $M=\sqrt{{L}_{1}{L}_{2}}$

(4) M = (L1 L2)2