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Question

Three identical conduting plates P1,P2 and P3 are kept at a distance d from each other as shown. If q,q,2q are the charges in P1,P2 and P3 respectively, the electric field between P1 and P2 is (where A is the area of plate)


A
(q2Aε0)
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B
(2q2Aε0)
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C
\N
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D
(4q2Aε0)
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Solution

The correct option is C \N

The electric field at any point outside of conducting plate is E=σ2ε0=Q2Aε0
where Q is charge on plate and A is area of it.
Here, the field between P1 and P2 is
=12Aε0[q(q+2q)]=0

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