A capacitor of $20\,\mu F$ is charged to $500\;volts$ and connected in parallel with another capacitor of $10\,\mu F$ and charged to $200\;volts$. The common potential is.......$volts$
Medium
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$V = \frac{{{V_1}{C_1} + {V_2}{C_2}}}{{{C_1} + {C_2}}}$$ = \frac{{500 \times 20 + 200 \times 10}}{{20 + 10}} = 400\,V$
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