Question

Two metallic charged sphere whose radii are 20 cm and 10 cm respectively, each having 150 mC positive charge. The common potential after they are connected by a conducting wire is –

• A. 9 × 10⁶ V
• B. 4.5 × 10⁶ V
• C. 1.8 × 10⁷ V
• D. 13.6 × 10⁶ V

Answer 1

Answer: (A)

9 × 10⁶ V

Answer 2

V== =$\frac { 300 \times 10 ^ { - 6 } \times 9 \times 10 ^ { 9 } } { 30 \times 10 ^ { - 2 } }$= 9 × 10⁶ V