A hollow metallic sphere of radius r is kept at potential of 1 volt. The total electric flux coming out of the concentric spherical surface of radius R (>r) is
- A. 4π ε0 r
- B. 4π ε0 r^2
- C. 4π ε0 R
- D. 4π ε0 R^2
Answer: A. 4π ε0 r
Explanation: Potential of a conducting sphere V = Q / (4πε0 r). For V = 1 V, total charge Q = 4πε0 r.