Question

A point charge of -4.00 nC is at the origin, and a second point charge of 6.00 nC is on the x axis at x = 0.810 m . Find the magnitude and direction of the electric field at each of the following points on the x axis. A) x=21.0cm B) 1.30m C) -19.0cm

Answer 1

PART A)

Electric field at x = 21 cm

$E = \frac{kq_1}{r_1^2}+ \frac{kq_2}{r_2^2}$

$E = \frac{k*(-4nC)}{0.21^2}+ \frac{k*6nC}{(0.81 - 0.21)^2}$

PART B)

Electric field at x = 1.3 m

$E = \frac{kq_1}{r_1^2}+ \frac{kq_2}{r_2^2}$

$E = \frac{k*(-4nC)}{1.3^2}+ \frac{k*6nC}{(1.3 - 0.81)^2}$

PART C)

Electric field at x = -19 cm

$E = \frac{kq_1}{r_1^2}+ \frac{kq_2}{r_2^2}$

$E = \frac{k*(-4nC)}{0.19^2}+ \frac{k*6nC}{(0.81 + 0.19)^2}$