Two conducting spheres of radii $5\, cm$ and $10\, cm$ are given a charge of $15\,\mu C$ each. After the two spheres are joined by a conducting wire, the charge on the smaller sphere is.......$\mu C$
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(b) Charge on smaller sphere
= Total charge $\left( {\frac{{{r_1}}}{{{r_1} + {r_2}}}} \right) = 30\,\left( {\frac{5}{{5 + 10}}} \right) = 10\,\mu C$
= Total charge $\left( {\frac{{{r_1}}}{{{r_1} + {r_2}}}} \right) = 30\,\left( {\frac{5}{{5 + 10}}} \right) = 10\,\mu C$
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