Question

Two solenoids of same cross-sectional area have their
lengths and number of turns in ratio of 1 : 2. The ratio of
self-inductance of two solenoids is
(a) 1 : 1 (b) 1 : 2 (c) 2 : 1 (d) 1 : 4

Answer 1

Answer:

self-inductance is directly proportional to the square of its number of turns

L

2

L

1

= (

N

2

N

1

)

2

L

1

L

2

=

4

1

Answer 2

Answer:

self-inductance is directly proportional to the square of its number of turns

Explanation:

L1/L2 = N1 square . I2 / I1 . N2 square

         = 1 . 2/ 2.1 = 1/1

so the answer is   L1:L2 = 1:1