You have two marbles, one carrying a uniformly distributed charge qp = +1.0 C an

Question

You have two marbles, one carrying a uniformly distributed charge qp = +1.0 C and the other carrying a uniformly distributed charge qn = -0.30 C .

Part A

What is the magnitude of the electric force between them when they are held 200 mm apart?

Part B

What happens when the marbles are released and so are free to move?

A. The marbles will move move away each other with constant speed.

B. The marbles will move toward each other with increasing speed.

C. The marbles will move move away each other with increasing speed.

D. The marbles will move toward each other with constant speed.

E. The marbles will not move.

Part C

If the marbles are metallic and share charge when they come in contact with each other, what is the magnitude of the electric force between them when they are again moved 200 mm apart, assuming no charge is transferred either to or from the surroundings of the two-marble system?

Explanation / Answer

Part A

F = kq1*q2/r2 =9x109* 1x10-6* 0.30x10-6/0.22 =67.5 x 10-3 N..........Ans.

Part B

B. The marbles will move toward each other with increasing speed.

Part C

when they are in contact and apart after that the force will be same as per part A

67.5 x 10-3 N..........Ans.

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