Physics multiple choice

Two charges Q1 and -Q2 are separated by a distance r. The charges attract each other with a force F. What is the new force between the charges of the distance is tripled?

1/9 F

Two positive charges Q1 and Q2 are separated by a distance r. The charges repel each other with a force F. If the distance between the charges is cut to one-fourth what is the new force acting on each charge?

16F

Sphere A carries a positive charge 4Q and sphere B is neutral. Initially the spheres are separated by a distance r. The spheres briefly touch each other and move to the initial separation. What is the new charge on each sphere?

2Q

A positively charged sphere with a charge of the of 8Q is separated from a negatively charged sphere - 2Q by a distance r. The spheres briefly touch each other and move to the original distance are. What is the new charge on each sphere after they move to the distance r?

3Q

Two positive charges Q1 and Q2 are separated by a distance r. The charges repel each other with a force F. If the magnitude of each charge is doubled and the distance stays unchanged what is the new force between the charges?

4F

A plastic rod is rubbed with a piece of animal fur. The plastic rod acquiires a negative charge during this process. Which of the following is true about the charge on the piece of fur?

It acquires a positive charge with the same magnitude as the rod

A positively charged rod is brought close to one end of a neural metallic plate. What type of charge is induced on the closest side if the plate?

Negative

A positively charged sphere A is brought close without touching to a neutral sphere B. Sphere B is touched with a grounded wire. What is the charge in sphere B after the wire is removed?

Negative

A positively charge rod is brought close to one end of a neutral metallic plate. What type of charge is induced on the farthest side of the plate?

Positive

Two positive charges with magnitudes 4Q and Q are separated by a distance r. Which of the following statements is true?

The forces on each charge are the same in magnitude and opposite in direction