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Electricity

Cool goIITian

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22 Jul 2012 15:38:57 IST

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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.

Comments (6)

vidya shankar

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22 Jul 2012 15:39:39 IST

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(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

vidya shankar

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22 Jul 2012 15:41:56 IST

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

Kashu_ingenious

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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.

vidya shankar

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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

Kashu_ingenious

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22 Jul 2012 17:18:10 IST

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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

vidya shankar

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Posts: 51

23 Jul 2012 16:21:00 IST

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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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