[" Two solenoids of equal number of turns have their lengths and the radii in the same ratio "1:2." The "],[" ratio of their self inductances will be "]

Two solenoids of equal number of turn have their lengths and the radii in the same ratio 1:2. The ratio of their self inductances will be

Two solenoids of equal number of turns have their lengths and the radii in the same ratio 1:4. The ratio of their self inductances will be

Two solenoids of equal number of turns have theirdengths and radii in the same ratio 1:2 , What is the ratio of their self inductances?

The self-inductance of two solenoids A and B having equal length are same. If the number of turns in two solenoids A and B are 100 and 200 respectively the ratio of the radii of their cross section will be ........