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Find the mutual inductance between the c...

Find the mutual inductance between the circular coil and the loop shown in figure.

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emf induced =(mu_(0)(a_1)^2 (a_2)^2 Erv)/(2L(a^(2)+x^(2))^(3//2)((Rx)+r^(2))`
[From question 20]
`(d phi)/(dt)=(ERV)/(L((Rx)/(L)+r)^2)`
M=(E )/((di)/(dt))=(N(mu_0)(pi)a^(2)a^(2))/(2 (a^(2)+x^(2))^(3//2))`.
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