Two plane circular coils P and Q have radii `r_(1)` and `r_(2)`, respectively, `(r_(1) lt lt r_(2))` and are coaxial as shown in fig. The number of turns in P and Q are respectively `N_(1)` and `N_(2)`. If current in coil Q is varied steadily at a rate x ampere/second then the induced emf in the coil P will be approximatery - A. `mu_(0)N_(1)N_(2) pi r_(1)^(2)`B. `mu_(0)N_(1)N_(2)pi r_(1)^(2) x`C. `mu_(0)N_(1)N_(2) pi r_(1)^(2) x// 2r_(2)`D. zero

Two plane circular coils P and Q have radii `r_(1)` and `r_(2)`, respe

1.	Two plane circular coils P and Q have radii `r_(1)` and `r_(2)`, respectively, `(r_(1) lt lt r_(2))` and are coaxial as shown in fig. The number of turns in P and Q are respectively `N_(1)` and `N_(2)`. If current in coil Q is varied steadily at a rate x ampere/second then the induced emf in the coil P will be approximatery - A. `mu_(0)N_(1)N_(2) pi r_(1)^(2)`B. `mu_(0)N_(1)N_(2)pi r_(1)^(2) x`C. `mu_(0)N_(1)N_(2) pi r_(1)^(2) x// 2r_(2)`D. zero
Answer» Correct Answer - C `phi=Mi` `e=(Mdi)/(dt)=Mx=(mu_(0)N_(1)N_(2) pi r_(1)^(2)x)/(2r_(2))`

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