The self inductance L of a solenoid of length l and area of cross-section A, with a fixed number of turns N increases as

The self inductance of a solenoid of length L, area of cross-section A and having N turns is-

What is the self - inductance of a solenoid of length 40 cm , area of cross - section 20 cm ^(2) and total number of turns 800 .

What is the self-inductance of solenoid of length 31.4 cm, area of cross-section 10^(-3)m^(2) and total number of turn 10^(3) ?

The self inductance of a long solenoid cannot be increased by

The self inductance of a coil is L . Keeping the length and area same, the number of turns in the coil is increased to four times. The self inductance of the coil will now be

Resistance of a conductor of length l and area of cross-section A is R. If its length is doubled and area of cross-section is halved, then find its new resistance.