When two charged capacitors having capacitance and potential C₁, V₁ and C₂, V₂ are joined with a wire, the common potential will be:
A. C₁ V₁ + C₂ V₂ / C₁ + C₂
B. C₁ + C₂ / V₁ + V₂
C. C₁ V₁ / C₂ V₂
D. C₁ V₂ + C₂ V₁ / C₁ + C₂