Question

The insulation property of air breaks down when the electric
field is 3 × 10⁶ Vm⁻¹. The maximum charge that can be
given to a sphere of diameter 5 m is approximately
(a) 2 × 10⁻² C (b) 2 × 10⁻³ C
(c) 2 × 10⁻⁴ C (d) 2 × 10⁻⁵ C

Answer 1

Explanation:

Maximum Electric field , E=4πϵ01r2Q=3×106

r=25=2.5

∴Q=4πϵ0r2E=9×1093×106×6.25=2×10−3C

Answer 2

Answer:

(b)2×(10)-3 C is the answer