दिखाए गए चित्र में अन्योन्य प्रेरकत्व है-

Options

A. शून्य
B. `(mu_(0)b)/(2pi)log_(e ) (a)/(b)`
C. `(mu_(0)b)/(2pi)log_(e ) (1+(b)/(a))`
D. `(mu_(0)b)/(2pi)log_(e ) (1+(a)/(b))`

Answer

D

Explanation

`phi = MI = int B*d A`
`MI = int_(a)^(a+b) (mu_(0)I)/(2pi x)xx dbx`
`M= (mu_(0)b)/(2pi) int_(a)^(a+b) (dx)/(x)`
`M= (mu_(0)b)/(2pi)log_(e ) [(a+b)/(a)]`
`M= (mu_(0)b)/(2pi)log_(e )[1+(b)/(a)]`