Q.

When the number of turns in a coil is doubled without any change in the length of the coil, its self-inductance

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a

becomes four times

b

is doubled

c

is halved

d

is unchanged

answer is A.

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Detailed Solution

L∝N2, i.e., L1L2=N1N22⇒L2=L1N2N12=4L1
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When the number of turns in a coil is doubled without any change in the length of the coil, its self-inductance