Question

A conductor of any shape, having area 40 cm² placed in air is uniformly charged with a charge 0.2 μC. Determine the electric intensity at a point just outside its surface. Also, find the mechanical force per unit area of the charged conductor.

(ε₀ = 8.85 x 10^–12 S.I. units)

Answer 1

Given: Q = 0.2 μC = 0.2 x 10^–6 C, A = 40 cm² = 40 x 10^–4 m²

ε₀ = 8.85 x 10^–12 S.I. units

To find: 

a. Electric field intensity (E) 

b. Mechanical force per unit area (f)

Formulae:

Calculation: Using formula (a) and (c),

a. Electric intensity is 5.649 x 10⁶ V/m  

b. Mechanical force per unit area is 141.2 N/m²