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Positive and Negative Charges

If a positive charge and a negative charge held near each other are released, what happens to the forces on each particle as they move?

Charged particles

There are two charged particles that repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is also doubled, then what would the force be and why?

Electric Current Through a Lightbulb

The Current Through a Lightbulb in a flashlight is 0.750 A. a) How many electrons entered the filament every second? b) How many electrons exited the filament every second? c) Where do the electrons entering the filament come from? Where do they go after exiting?

Algebraic Expressions

1. Simplify: 8[a - b(3- 4a)] - 6a[2-a(3-b)] 2. Simplify: (6x2 - 3y + 2z2) + (7y + 8x2) + (3y2 - 4x) 3. Subtract 6x2 - 4y2 + 8xy from 9x2 + xy - 3y2. 4. Simplify 2 [(4x + 6) - (x - 6) + (4x - 8)/2] 5. Simplify the expression: 8 - [3x + 9y - {2x - y} + 8x + 5y] 6. Simplify 3(6x - 5) - [3(1 - 8x) + 5] 7. If P = 3y + 7x

Surface charge density

The normal of a spherical surface is r^. Just inside the surface, the electric field is E,in = 15 N/C r^ and just outside the surface the electric field is Eout = -25 N/C r^. What is the surface charge density of surface?

Relationship of Forces

With respects to forces, how are electric charge and mass alike? How are they different? I am not sure but does this have anything to do with Coulomb's Law??

The Net Electric Field

Question: Two charges, -18 and +4.0 microcoulombs, are fixed in place and separated by 3.0 meters. At what spot along a line through the charges is the net electric field zero? Locate this spot relative to the positive charge. Let the positive charge be at x=0 and the negative charge be at x=3.0 meters. Make sure the answer is i

Elecrostatic force

An equilateral triangle has sides of 0.12 meters. Charges of -8.6, +8.0 and +1.6 micro Coulombs are located at the corners of the triangle. Find the magnitude of the net electrostatic force exerted on the 1.6 micro Coulomb charge.

Electrostatic Force

If the electrostatic force between two protons is equal to 1X10^-7 Newtons, what is the distance between them?

Electricity Problem

Two identical +7.5e-6 point charges are intially spaced 5.5cm from each other. If they are realesed at the same instant from rest, how fast will they be moving when they are very far away from each other? Assume they have identical masses of 1.0 mg.


A certain charge Q is divided into two parts q and Q-q. How the charges Q and q must be related so that when q and (Q-q) placed at a certain distance apart experience maximum electrostatic repulsion.