Question

Two metallic charged spheres whose radii are 20 cm and 10 cm respectively having each 150 microcoulomb 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. 13.5 × 10⁶ V

Answer 1

Answer: (A)

9 × 10⁶ V

Answer 2

V_common =

= $\frac { 300 \times 9 \times 10 ^ { 3 } } { 30 \times 10 ^ { - 2 } }$ = 90 × 10⁵ = 9 × 10⁶ volt