Four very large metal plates are given the charges as shown in figure. The middle two are then connected through a wire. Find the charge that will flow through the wire
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Distribution of charge before the wire is connected is shown in figure.

On connecting will wire $5 \mathrm{Q}$ and $-5 \mathrm{Q}$ will get neutralize. Hence $5 \mathrm{Q}$ charge will flow from $\mathrm{A}$ to $\mathrm{B}$

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