$A$ and $B$ are two identical spheres charge on them is $7\,\mu C$ and $1\,\mu C$ respectively. Now both are connected by a wire. Calculate flow of charge from $A$ to $B$......$\mu C$
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Charge on $\mathrm{A}$ before connection $=7\, \mu \mathrm{C}$

charge on $\mathrm{A}$ after connection $=\frac{7+1}{2}=4\, \mu \mathrm{C}$

Charge flow from $A$ to $B=7\, \mu C-4\, \mu C$

$=3\, \mu \mathrm{C}$

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