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16 Sep 2009 12:06:26 IST

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consider a circle of radius R. a point charge lies on the axis of the cicle at a distace of R/ROOT3

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consider a circle of radius R. a point charge lies on the axis of the cicle at a distace of R/ROOT3 FROM ITS CENTRE IF THE FLUX THROUGH THE CIRCLE IS 'K' FIND MAGNITUDE OF THE POINT CHARGE.

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~Áß???????

Blazing goIITian

Joined: 31 Aug 2008

Posts: 982

16 Sep 2009 16:42:02 IST

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well.vignesh ..!!

...i don`t think this question is under scope of iit...or aieee..

or any engineering exam..

as here there is no ...symmetric gausian surface possible...

so ..we can`t evaluate flux directly..

here we hv to take the concept of solid angle...

which is purely out of jee..

and moreover it will require intense integration..

frm ..where did u got this sum....

PLZZZZ....SOLVE THIS IF ANYBODY CAN..!!

adi

Blazing goIITian

Joined: 29 Apr 2009

Posts: 1581

16 Sep 2009 16:57:18 IST

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is the answer ...............

q=4kepsilon

adi

Blazing goIITian

Joined: 29 Apr 2009

Posts: 1581

16 Sep 2009 17:02:05 IST

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the solid angle subtended by the circle at the point is............

2pi(1-cos(semi vertex angle))

semi vertex angle = 60 deg.............

solid angle=2pi(1/2)=pi..

flux k =solid angle * q/(4pi epsilon)

k=q/4epsilon...

q=4kepsilon.......................

u can also do this by integration

~Áß???????

Blazing goIITian

Joined: 31 Aug 2008

Posts: 982

16 Sep 2009 17:20:41 IST

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i hv already mentioned ....here we hv to use solid angle which is outside JEE COURSE ...MOREOVER IN JEE COURSE WE DEAL WITH FLUX ONLY FOR SYMMETRIC gaussian surfaces...!!..for non symmetric surfaces ...we apply above method..!! ....thanx karna ...!! :)

VIGNESH BHAT

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Joined: 23 Sep 2009

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23 Sep 2009 11:54:51 IST

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WELL IAM SORRY I WAS NOT ONLINE SINCE 3 DAYS.......... YET THANKS FOR THE INFOMATION.... IT S A QUESTION ASKED IN THE INDIAN PHYSICS OLYMPIAD 2009.... I TRIED IT BY TAKING ANY ELEMENTARY RING IN THE CIRCLE BUT I WASNT GETTIN THE RIGHT ANS

Soumen Goswami

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Joined: 10 Apr 2007

Posts: 1777

3 Oct 2009 18:35:10 IST

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