Two coaxial long solenoids of equal length have current, `i_(1), i_(2)`, number of turns per unit length `n_(1), n_(2)` and radius `r_(1), r_(2)` respectively. If `n_(1)i_(1)=n_(2)i_(2)` and the two solenoids carry current in opposite sence, the magnetic energy stored per until length is `[r_(2)gt r_(1)]`

Two coaxial long solenoids of equal length have current, i_(1), i_(2) , number of turns per unit length n_(1), n_(2) and radius r_(1), r_(2) respectively. If n_(1)i_(1)=n_(2)i_(2) and the two solenoids carry current in opposite sense, the magnetic energy stored per unit length is [r_(2)gt r_(1)]

Two long co-axial solenoids have radii, and number of turns per unit length equal to r_(1), r_(2) and n_(1), n_(2) respectively where suffix 1 refers to the outer solenoid and 2 refers to the inner solenoid. Length of both is l. The current in the outer solenoid is made to grow as I_(1) = kt where t is time. Resistance of the wire used in inner solenoid is R. Write the current induced in the inner solenoid assuming that it is shorted.

Two coaxil solenoids 1 and 2 of the same length are set so that one is inside the other. The number of turns per unit length are n_(1) and n_(2) . The current i_(1) and i_(2) are flowing in opposite directions. The magnetic field inside the inner coil is zero. This is possible when

Two coaxil solenoids 1 and 2 of the same length are set so that one is inside the other. The number of turns per unit length are n_(1) and n_(2) . The current i_(1) and i_(2) are flowing in opposite directions. The magnetic field inside the inner coil is zero. This is possible when

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 :

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 :

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_(1)/n_(2) (B) n_(2)/n_(1).r_(1)/r_(2) (C) n_(2)/n_1.r_2^2/r_1^2 (D) n_(2)/n_(1)

A solenoid of radius R has n turns per unit length, then the self-inductance of the solenoid per unit length is