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Q.

Five identical plates each of area A are joined as shown in the figure. The distance between the plates is d. The plates are connected to a potential difference of  V volts. The charge on plates 1 and 4 will be 

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a

ε0AVd, 2ε0AVd

b

ε0AVd, 2ε0AVd

c

ε0AVd, 2ε0AVd

answer is B.

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Detailed Solution

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The given circuit can be redrawn as follows. All capacitors are identical and each having capacitance C=ε0Ad

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Charge on each capacitor = Charge on each plate
=ε0AdV

Therefore charge on plate 4 is 

=2ε0AdV

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