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Question:

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

9C1=4C2

3C1+5C2=0

5C1=3C2

3C1=5C2

Solution:

Potential can be made zero only if they have same charge.
⟹120C1=200C2
∴6C1=10C2
3C1=5C2