If a charge of +7 C and a charge of +4 C are 12 m apart how much force is between them?  Are the pushing away from each other or pulling towards each other?  (K = 9 x 109 Nm2/C2)

The sum of two point charges is +14 µC. When they are 3.1 cm apart, each experiences a force of 275 N. Find the charges given that the force is: a) repulsive. (List your two answers in increasing order of magnitude) µC, µC a) attractive. (List your two answers in increasing order of magnitude) µC,

Suppose we have two positively charged particles a distance of 4 m apart from each other. Particle 1 has a charge of 6C and particle 2 has a charge of 1.3 x 10^3 C. What amount of electrostatic force exists between these two particles? A)435 x 10^12N B)1.75 x 10^13 N C)6.5 x 10^2 N (aka 650 N)

= 32.2 nC. The figure below shows a small, hollow, plastic sphere hanging vertically from a thin, lightweight thread. The sphere has a mass of 7.10 g and a uniformly distributed charge of 91 Directly below it is a second sphere with the same mass, but a charge of 92 = -58.0 nC. (Assume this second sphere is fixed in place.) The centers of the two plastic spheres are a distance d = 2.00 cm apart. 91 92 (a) What is the tension (in N) in the thread? 0.11154376 N (b) The thread will break if the tension in it exceeds 0.180 N. What is the smallest possible value of d (in cm) before the thread breaks? The analysis is the same as in part (a), including the magnitude and direction of the gravitational and electric forces. Note that Coulomb's law depends on the square of the distance d. Use the threshold value of the tension to solve for d. cm