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Questions  

An air capacitor consists of two identical parallel plates  A and B as shown in figure. Plate A  is given change  Q and plate  B is given a charge 3Q . P  is the median plane of the capacitor. If C0 is the capacitance of the capacitor then

a
VP−VA=Q4Co
b
VP−VA=Q2Co
c
VP−VA=−QCo
d
VP−VB=−Q4Co

detailed solution

Correct option is B

The distribution of charges on plates areE at any point between the plates is E=σ2∈0+σ2∈0=σ∈=QA∈odv=−E.dr⇒VA−VP=−QA∈o×d2∴VP−VA=Q2Co

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