There are two long co-axial solenoids of same length l. The inner and other coils have redii `r_(1)` and `r_(2)` and number of turns per unti length `n_(1)` and `n_(2)` respectively .The reatio of mutual inductance to the self - inductance of the inner- coil is :
A
`n_2/n_1 .r_1/r_2`
B
`n_2/n_1`
C
`n_1/n_2`
D
`n_2/n_1. r_2^2/r_1^2`
Text Solution
Verified by Experts
The correct Answer is:
B
Self inductance `L=mu_0n_1^2 pir_1^2l` Mutual-inductance : `phi_1=(mu_0n_2 i) pir_1^2n_1l=(mu_0n_1n_2pir_1^2l)i` i.e. `M=mu_0n_1n_2pir_1^2l` So, `M/L=n_2/n_1 `
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VMC MODULES ENGLISH-JEE Main Revision Test-6 | JEE-2020 -PHYSICS
