Two concentric and coplanar coils have radii a and `b ( gt gt a)` as shows in Fig. Resistance of the inner coil is `R`. Current in the outer coil is increased from `0` to `i`, then the total charge circulating the inner coil is A. `(mu_(0) i a^(2)pi)/(2RB)`B. `(mu_(0)i ab)/(2R)`C. `(mu_(0)i a b)/(2a)(pi b^(2))/(R )`D. `(mu_(0)ib)/(2pi R)`

Two concentric and coplanar coils have radii a and `b ( gt gt a)` as s

1.	Two concentric and coplanar coils have radii a and `b ( gt gt a)` as shows in Fig. Resistance of the inner coil is `R`. Current in the outer coil is increased from `0` to `i`, then the total charge circulating the inner coil is A. `(mu_(0) i a^(2)pi)/(2RB)`B. `(mu_(0)i ab)/(2R)`C. `(mu_(0)i a b)/(2a)(pi b^(2))/(R )`D. `(mu_(0)ib)/(2pi R)`
Answer» Correct Answer - A `Delta q = (Delta phi)/(R ), phi = 0, phi_(f) = ((mu_(0))/(2)(i)/(b))(pi a^(2)) = (mu_(0)i a^(2) pi)/(2b)` `:. Delta phi = phi_(f) - phi_(i) = (mu_(0) i a^(2) pi)/(2b), " "` So, `Delta q = (mu_(0) i a^(2)pi)/(2 Rb)`

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