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Cool goIITian

Joined:	8 Apr 2009
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15 Aug 2009 21:06:58 IST

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When a choke coil carrying a steady current is short circuited.The current in it decreases to b(<1)

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When a choke coil carrying a steady current is short circuited.The current in it decreases to b(<1) times its initial value in a time T . The time constant of the choke coil is (a) T/b (B) T/ ln (1/b (c) T/ ln b (d) T ln b

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Chirag Sangani

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Joined: 12 Dec 2007

Posts: 611

18 Aug 2009 13:27:06 IST

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The current in the choke will decrease exponentially as

I(t) = I(0) e ^-t/K

Hence,

b = e ^-T/K

THus

K = T / ln(1/b)

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