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Blazing goIITian

Joined:	16 Mar 2008
Post:	1825

6 Jun 2009 22:37:57 IST

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341

nice electrodynamics sum

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A 4f capacitor and 6f capacitor are connected in parallel across a 660 v prallel source. The charged capacitors are now disconnected from the line and from each other with terminals of unlike signs together.find the final charges on each and voltage across each other.

!!!!!!!!!!!!!!!!!! i think the sum can be solved by gauss law

anyways give a suitable expln

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AIR 538 Asish

Blazing goIITian

Joined: 29 Nov 2008

Posts: 1137

7 Jun 2009 15:20:36 IST

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first of all wrong thread:

as they r connected in ll initially, so initial charge on 4f cap = 660*4 C and on 6f cap = 660*6 C

Now when unlike plates are connected together i.e. positive of one wid negative of other,

Then try and draw the fig. ..

Now q1 + q2 = 2640 - 3960 = -1320 C .... (i)

Also, q1c1 = q2c2 (pd = const)

So, 4q1 = 6q2 OR 2q1 = 3q2. .... (ii)

Solving we get

q2 = -528 C and q1 = -792 C

mite be incorrect also..

VARUN RAJ

Blazing goIITian

Joined: 16 Mar 2008

Posts: 1825

8 Jun 2009 06:46:36 IST

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wrong the answers are +5.28 and -7.92 i dont understant why gauss law isnt being used

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