Five identical capacitor paltes, each of area A, are arranged such that adjacent plates are at a distance d apart, the plates are connected to a source of emf V as shown in the figure

The charge on plate 1 is ………..and on plate 4 is.............

Explanation

From equivalent circuit diagram charge on first plate Q= CV
` rArr " " Q =( in _ 0 AV)/( d)`
Charge on fourth plate
Q ' C(-V)
` Q' ( - in _0AV)/( d) `
As plate 4 is repeated twice hence charge on 4 will be Q" =2Q'
` Q" = -( 2in _0 AV) /(d) `
Hence the correct answer will be (B)