Free problems arranged by topic
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

 Free problems: all problems
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

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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

Problem 92.

What is the magnitude of the electric force on  charge?

Solution

Problem 93.

For a system of charges shown in the figure find the magnitude of the force on  charge?

Solution

Problem 94.

Find the magnitude of the force on  charge.

Solution

Problem 95.

What is the magnitude of the force on  charge?

Solution

Problem 96.

Find the magnitude of the force on  charge.

Solution

Problem 97.

The force on  charge is zero. Find the value of the charge .

Solution

Problem 98.

Find the magnitude of the force on  charge.

Solution

Problem 99.

If charge  is in static equilibrium what is the value of charge ?

Solution

Problem 100.

What is charge  if charge  is in static equilibrium?

Solution

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