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Question


A large plate of uniform charge density is placed as shown, two cylinders of same volume are at distances r & 2r respectively, if energy (electrostatic) stored in them are UA & UB respectively then,

A
UA:UB=4:1
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B
UA:UB=1:1
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C
UA:UB=1:4
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D
UA:UB=8:1
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Solution

The correct option is B UA:UB=1:1
Energy = Energy density × volume
=120E2×(Volume)
UAUB=120E2A×Volume120E2B×Volume=(EAEB)2=1:1
Field is independent of distance in case of charged sheet.

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