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When the number of turns in a coil is do...

When the number of turns in a coil is doubled without any change in the length of coil its selfinductance becomes ________ .

A

Four times

B

Doubled

C

Halved

D

Squared

Text Solution

Verified by Experts

The correct Answer is:
A
`L = (mu_(0)n^(2)pir)/(2), L = (mu_(0)(2n)^(2)pi(r//2))/(2)`
`=2[(mu_(0)n^(2)pir)/(2)]`=2L
( When the number of turns in in a coil is doubled without changing the length of the coil, the radius of the coil is reduced to half )
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