SSC JE Electrical Engineering 2014 Set 1 Paper

Question : 123 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 time constant would

Solution:

Time Constant (T) =

L/ R

Now

L ∝ N^2

where N is Number of turn
∴

T∝ L ∝ N^2

if turn become 2N the time constant will become 4 time

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