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  4. Two capacitors C1 and C2 are charged to 120 V and 200 V respectively. It is found that by connecting them together the potential on each one can be made zero. Then

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Q. Two capacitors $C_1$ and $C_2 $ are charged to $120\, V$ and $200\, V$ respectively. It is found that by connecting them together the potential on each one can be made zero. Then

JEE MainJEE Main 2013Electrostatic Potential and Capacitance

Solution:

Polarity should be mentioned in the question.
Potential on each of them can be zero if, $q_{net}=0 $
or $q_1 \pm n q_2=0 $
or $120 C_1\pm200 C_2=0 $
or $3 C_1\pm5 C_2=0 $