Flag IIT JEE Entrance Exam> self-inductance-of-the-solenoid...
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If the number of turns per unit length of a coil of solenoid is doubled, the self-inductance of the solenoid will

(a) remain unchanged

(b) be halved

(c) be doubled

(d) become four times

Simran Bhatia , 11 Years ago
Grade 11
anser 2 Answers
Hrishant Goswami

Last Activity: 11 Years ago

(d)

        Self inductance of a solenoid =(µAn^2)/l

        So, self induction  proportional to n2

So, inductance becomes 4 times when n is doubled.

vedha prabhu

Last Activity: 6 Years ago

MAKE ALL THE PARAMETERS CONSTANT AS 1ASSUME THAT 
L IS DIRECTLY PROPORTIONAL TO N^2 i.e L =N^2
IF N=4 THEN L=4^2 = 16(x)
IF2N=2x4=8 THEN L= 8^2 =64(4x)
IF N IS DOUBLED THEN L WILL BE QUAD

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