When the length of the solenoid is doubled without any change in the number of turns and area of the coil. Then its self-inductance will be-

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RSMSSB JE Electrical (Diploma) 19 May 2022 Official Paper
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  1. Nine times
  2. Half times
  3. Doubled
  4. Unchanged

Answer (Detailed Solution Below)

Option 2 : Half times
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Detailed Solution

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Concept

The inductance of an air core solenoid is given by:

\(L={\mu _oN^2A\over l}\)

where, L = Inductance

N = No. of turns

A = Area 

l = Length

Explanation

From the above expression, we observed that self-inductance is inversely proportional to the length of the solenoid.

If the length of the solenoid is doubled, then its self-inductance will become half times.

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