Home » Ask & Discuss » Physics. » Electricity « Back to Discussion

Electricity

Blazing goIITian

Joined:	22 Feb 2008
Post:	370

20 Mar 2008 10:54:57 IST

0 People liked this

619

question on gauss thoeorem

None

consider the charge configuration and a spherical gaussian surface as shown in the figure.when calculating the flux of the electric field over the spherical surface,the electric field will be due to:

a) q2

b)only the positive charges

c)all the charges

d)+q1 and -q1

Share this article on:

Comments (11)

kewlslayer

Blazing goIITian

Joined: 22 Feb 2008

Posts: 370

20 Mar 2008 10:57:11 IST

Like 0 people liked this

plz tell me the reason also

suresan

Hot goIITian

Joined: 10 Mar 2008

Posts: 186

20 Mar 2008 14:27:55 IST

Like 0 people liked this

due to +q1 and -q2 since the Gauss's theorem is works with the net flux through the surface. Then we need to workout the flux due to every single charge with in the surface.

kewlslayer

Blazing goIITian

Joined: 22 Feb 2008

Posts: 370

20 Mar 2008 15:54:00 IST

Like 0 people liked this

so wat should be the answer according to you

the answer given in the book is c

'',' Off to a nu start!!

Blazing goIITian

Joined: 13 Jan 2007

Posts: 1289

20 Mar 2008 15:55:27 IST

Like 0 people liked this

dude it will be due to all charges.....look in hcv..everywhere its written that E is due to all charges present there...

arpan1

Blazing goIITian

Joined: 15 Mar 2008

Posts: 684

20 Mar 2008 15:55:41 IST

Like 3 people liked this

electric field is due to all the charges however flux is due to charges inside the guassian surface..

remember this always

RATE ME

/-\|\|(|-|/-\|_

Scorching goIITian

Joined: 11 Mar 2007

Posts: 268

20 Mar 2008 16:10:15 IST

Like 1 people liked this

yup
in gauss lass electric field will be due to all charges present in surroundings
whether outside or inside gaussian surface.
bt flux will only due to charges present inside gaussian surface.

Gaurav |spideyunlimited| Ragtah

Moderator

Joined: 16 Dec 2006

Posts: 3373

20 Mar 2008 16:14:51 IST

Like 2 people liked this

Field will be due to all the charges
( but flux due to the charge outside will be 0 since number of field lines entering the sphere are the same as those leaving it)

kewlslayer

Blazing goIITian

Joined: 22 Feb 2008

Posts: 370

20 Mar 2008 16:50:59 IST

Like 0 people liked this

thank you people

kewlslayer

Blazing goIITian

Joined: 22 Feb 2008

Posts: 370

21 Mar 2008 12:43:20 IST

Like 0 people liked this

hey i saw the same ques in some other book with an extra option

ie( field will be uniform on the surface)

and that is the correct answer given there

so the anwer i think should be due to all charges and the field should be uniform

gokul subramanian

Blazing goIITian

Joined: 28 Jan 2008

Posts: 1451

21 Mar 2008 12:52:40 IST

Like 0 people liked this

spidey flux due to outside chrg is 0..so how does it affect the field...do u mean sumtin lik it creats a field whcih has mag 0..n so it also contributes?

Gaurav |spideyunlimited| Ragtah

Moderator

Joined: 16 Dec 2006

Posts: 3373

21 Mar 2008 16:06:56 IST

Like 0 people liked this

yep phi = integral (E.ds.cos @)
net integral is 0 but not necessary that E = 0

Quick Reply

Reply

	Some HTML allowed.
	Keep your comments above the belt or risk having them deleted.
	Signup for a avatar to have your pictures show up by your comment
	If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team