and area of
cross-section A, with a fixed number of turns N increases as
(a) and A increase
(b) decreases and A
increases
(c) increases and A
decreases
(d) both and A
decrease
Answer:
(b)The self-inductance
L of a solenoid of length 
and area
of cross section A with fixed number of turns is
Obviously,
L increases when decreases and A
increases. Choice (b) is correct
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