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 :

Find the mutual inductance of two long concentric solenoids for a length l. The area of cross-section of inner solenoid is A and number of turns per unit length are n_(1) and n_(2) .

Find the mutual inductance of two long concentric solenoids for a length I. The area of cross-section of inner solenoid is A and number of turns per unit length are n_(1) and n_(2) .

A solenoid S_1 is placed inside another solenoid S_2 as shown in the fig. The radii of the inner and the outer solenoids are r_1 and r_2 respectively and the numbers of turns per unit length are n_1 and n_2 respectively. Consider a length I of each solenoid. Calculate the mutual inductance between them.

A solenoid S_1 is placed inside another solenoid S_2 as shown in the fig. The radii of the inner and the outer solenoids are r_1 and r_2 respectively and the numbers of turns per unit length are n_1 and n_2 respectively. Consider a length I of each solenoid. Calculate the mutual inductance between them.

If the number of turns per units length of a coils of solenoid is doubled , the self- inductance of the soleniod will

If the number of turns per units length of a coils of solenoid is doubled , the self- inductance of the soleniod will