Two unknown neutral substances are rubbed together. During the process the first substance becomes positively charged and the second substance

Two charges, each q, are separated by a distance r, and exert mutual attractive forces of F on each other. If both charges become 3q and the distance becomes 3r, what are the new mutual forces?

Two isolated charges, + 3q and - 3q, are 6 cm apart. If 3F is the magnitude of the force acting on charge - 3q, what is the magnitude and direction of the force acting on charge + 3q?

A negatively charged rod is brought near one end of an uncharged metal bar. The end of the metal bar farthest from the charged rod will be charged

Two identical conducting spheres are separated by a distance. Sphere A has a net charge of 5 µC and sphere B has a net charge of 1 µC. If the spheres touch and are moved apart, the net charge on Sphere A will be:

Sphere A carries a net charge and sphere B is neutral. They are placed near each other on an insulated table. Which statement best describes the electrostatic force between them?

Sphere A carries a net positive charge, and sphere B is neutral. They are placed near each other on an insulated table. Sphere B is briefly touched with a wire that is grounded (see picture). Which statement is correct?

Two positive charges A and B are placed at the corners of equilateral triangle. What is the direction of the net electric force on charge –Q located at point C?

Two positive charges A and B are placed at the corners of equilateral triangle. What is the direction of the net electric force on charge –Q located at point C?

MULTICORRECT (Choose 2): As shown on the right, a positively charged sphere, Q₁ = 3Q is separated from a negatively charged sphere, Q₂ = -10Q by a distance r. The spheres briefly touch each other and move to the original distance r. Which of the following is true about the new charge on the spheres and the new force between the spheres?