SSC JE Electrical Engineering 2012 Paper

Question : 188 of 200

Marks: +1, -0

A coil with a certain number of turns has a specified time constant. If the number of turns is doubled, its times constant would

Solution:

Both Time constant in R-L circuit (T)

=L/R

L={N^2µA}/L

, N = Number of turn

T ∝ L ∝N^2

if number of turn is doubled to (2N).

T∝4N

then time constant will be four time.

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