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Two solenoids of equal length and al...

Two solenoids of equal length and almost equal cross-sectional area are fully inserted into one another Find their mutual inductances are equal to `L_(1)` and `L_(2)`.

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Verified by Experts

We use `L_(1) = mu_(0) n_(1)^(2) V, L_(2) = mu_(0) n_(2)^(2) V`
So, `L_(12) = mu_(0) n_(1) n_(2) V = sqrt(L_(1) L_(2))`
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