Question

1) Three charges are placed along the x-axis. At -4 cm, a charge of +0.7 uc, at the origin, +1 uc, and at +6 cm, a charge of 2 uС. Find the net force (magnitude and direction) on the central charge. 2) In the above system, what is the electric field at the point on the x-axis x=-2 cm? What would be the acceleration experienced by an 80 nC charge with mass 107 kg?

Answer 1

1)

k9192 F =

F =- 9* 109 * 2 * 10-12 0,062 9 * 10°* 0.7 * 10-12 - = 1.0625 N 0.042

Direction = along negative x-axis

2)

$E=\frac{kq}{r^{2}}$

9* 10%* 2 * 10-6 E=- 9 * 109 * 1 * 10-6 0.022 9* 10%*0.7 * 10-6 -= 9562500 N/C 0.022 0,082

Eg 80 * 10-9* 9562500 P= 7.65 * 10 m/s 10-7