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Electricity

Cool goIITian

 Joined: 17 Jun 2012 Post: 51
22 Jul 2012 15:38:57 IST
3 People liked this
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JEE-2007 Problem
Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Physics , Electricity

A long, hollow conducting cylinder is kept coaxially inside another long, hollow conductingcylinder of larger radius. Both the cylinders are initially electrically neutral.

Cool goIITian

Joined: 17 Jun 2012
Posts: 51
22 Jul 2012 15:39:39 IST
1 people liked this

(A) A potential difference appears between the two cylinders when a charge density is given tothe inner cylinder(B) A potential difference appears between the two cylinders when a charge density is given tothe outer cylinder(C) No potential difference appears between the two cylinders when a uniform line charge is keptalong the axis of the cylinders(D) No potential difference appears between the two cylinders when same charge density is givento both the cylinders

Cool goIITian

Joined: 17 Jun 2012
Posts: 51
22 Jul 2012 15:41:56 IST
0 people liked this

i want to ask how a potential differnce is there b/w the two cylinders since E-field should be zero inside the conductor..

New kid on the Block

Joined: 19 Aug 2011
Posts: 12
22 Jul 2012 16:15:48 IST
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Answer is (a)when charge is given to inner cylinder there would be some electric field between the empty space and hence potential difference.

Cool goIITian

Joined: 17 Jun 2012
Posts: 51
22 Jul 2012 16:54:05 IST
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will not charges be induced inside the OUTER cylinder to cancel the E-field... since E-FIELD inside a condutor is ZERO

New kid on the Block

Joined: 19 Aug 2011
Posts: 12
22 Jul 2012 17:18:10 IST
1 people liked this

OK let me explain.The electric field inside a conductor is zero.That means the field between the two surfaces of the conductor and therefore charge will be induced on its surfaces.But if we talk about the empty space btween the cyls. there exists an e-field

Cool goIITian

Joined: 17 Jun 2012
Posts: 51
23 Jul 2012 16:21:00 IST
1 people liked this

so u mean to say, there exists an electric field but NET Electric field will also be zero.. rite..?

so if we keep a point charge inside a cavity of the conductor ,so what we can say about the elctric field inside the cavity ?

-it will be non zero due to the point charge but NET e-field wud be zero ?

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