Question

1-5. Two point charges, q1 = 8 µC and q2 = -5 µC, are separated by a distance r = 0.1 m. What is the magnitude of the electric force? Note: 1 µC = 10-6 C.

6-10. Three positive point charges of 3.0 µC, 6.0 µC, and 2.0 µC, respectively, are arranged in a triangular pattern, as shown in the figure below. Find the magnitude and direction of the electric force acting on the 6.0 µC charge.

Answer 1

1.

$F=\frac{kq_1q_2}{r^2}=36~N.$

2.

$F=\frac{kq_2(q_1-q_3)}{3r^2}=1.8~kN.$