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Electricity

Blazing goIITian

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14 Mar 2009 18:49:01 IST

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A 3uF capacitor is charged to a potential of 300V and a 2uF capacitor is charged to200V.The capacito

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A 3uF capacitor is charged to a potential of 300V and a 2uF capacitor is charged to200V.The capacitors are connected in parallel with plates of opposite polarity joined together. What amount of charge will flow when the plates are so connected?

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JPS

Blazing goIITian

Joined: 21 Nov 2008

Posts: 1020

15 Mar 2009 19:42:52 IST

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hey someone reply......

Ayush

Hot goIITian

Joined: 11 Mar 2008

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15 Mar 2009 19:49:51 IST

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wats d case of V when C conn. in parallel???

is it same fro the whole sys.??? i

if same, how can we cal .it???

akki ~~ unlucky forever ~~

Blazing goIITian

Joined: 11 May 2008

Posts: 491

15 Mar 2009 20:19:11 IST

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let v be the final pd across the combination,

900-400 = 3v+2v

v=100 volt.

so final charge on 3uF cap = 300 uC, &on 2uF=200uC

so, total charge passed = 900-300 = 600uC

james the bond

Cool goIITian

Joined: 6 Jun 2008

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15 Mar 2009 20:46:43 IST

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see the charge is conserved in this case

let the initial charges be q1 and q2 and final charges be Q1 andQ2

in parallel the potential across both is same

therefore, q1+q2=Q1+Q2

or, c1.v1+c2.v2=c1.v+c2.v where v is the final potential

from here we get v=(c1.v1+c2.v2)/(c1+c2)

now Q1=c1.v=c1*(c1.v1+c2.v2)/(c1+c2)

and q1=c1.v1

charge flown=|q1-Q1|

substitute the values and get ur answer

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