Question

A charge of 17.7 x 10-4 c is distributed uniformly over a large sheet of area 200 m2 . calculate the electric field intensity at a distance of 20cm form it in air.

Answer 1

The formulae for getting electric field intensity is:

E = (k × Q) / d²

Where E is the intensity in Newtons per Coulomb, Q the charge in coulombs, k a constant and d the distance in meters.

k=9.0 × 10⁹NM²/C²

Q=17.7 × 10⁻⁴ C

d =20/100 = 0.2m
d² =0.04

E = (17.7 × 10⁻⁴ × 9.0 × 10⁹) / 0.04= (1.593 ×10⁷) /0.04= 3.98 × 10⁸N/C