# The self-inductance L of a solenoid of length

Question:

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

(a) l and A increase.

(b) l decreases and A increases.

(c) l increases and A decreases.

(d) both l and A decrease.

Solution:

(b) l decreases and A increases.