- #1

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## Homework Statement

Two coils of the same length and almost the same cross-section are put one inside the other.

Find their mutual inductance if the self-inductances are

## Homework Equations

1) [itex] \phi_i=L_i I_i [/itex]

2) [itex]\phi=\iint_A \vec{B} \cdot d\vec{A} [/itex]

3) [itex] \phi_1=M_{12} I_2 [/itex]

## The Attempt at a Solution

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I've tried working with the equations, substituting one into the other in order to get something that looks like equation 3) but I can't seem to get it...

Thanks,

R