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If r1 and r2 represent radii of two conc...

If `r_1 and r_2` represent radii of two concentric coil `(r_2gt gt r_1)` then give the expression for the coefficient of mutual inductance for the pair of coils.

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`M_(12)=M_(21)=(mu_0mu_rpir_1R_1^2)/(2r_2)`
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SUBHASH PUBLICATION-ELECTROMAGNETIC INDUCTION-NUMERICALS WITH SOLUTIONS
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