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Questions  

Force acting upon a charged particle kept between the plates of a charged condenser is F. If one plate of the condenser is removed, then the force acting on the same particle will become

a
0
b
F / 2
c
F
d
2F

detailed solution

Correct option is B

Initially F = qE and E=σε0 ∴F=qσε0If one plate is removed, then E becomes σ2ε0So F'=qσ2ε0=F2

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