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Physics problems: electricity

Coulomb's law

 

Problem 1.

Two small spheres spaced 35.0cm apart   have equal charge.  How many excess electrons must be present on each sphere if the  magnitude of the force of repulsion between them is ?

Solution

 

Problem 2.

A point charge is at the point , , and a second point charge is at the point , .  Find the magnitude and direction of the net electric field at the origin.

Solution

 

Problem 12.

Suppose that of hydrogen is separated into its constituent protons and electrons, and that the protons are all grouped together at one point, and the electrons at another point, 3 meter distant. What is the magnitude of the force between the two groups of charge?

Solution

 

Problem 13.

Two small beads having positive charges 25q and q are fixed at the opposite ends of a horizontal insulating rod, extending from the origin (the location of the larger charge) to the point x = d. A third small charged bead is free to slide on the rod. At what position is the third bead in equilibrium?

Solution

 

Problem 36.

A cube of edge a carries a point charge q at each corner. Find the resultant electric force on any one of the charges.

Solution

 

 

 

 

 

 

 

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