Coulomb Example

 

x =  m        q = C

This animation allows you to add charges, move them around and see the force vectors between the charges. Use the text box for charge to add the charges.  The arrows on the screen show how the particles interact with each other by showing both the magnitude (relative size of the arrow) and direction of the electrostatic force.   Restart.

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  1. Now reset the animation and create two charges with different amounts of charge but of the same polarity (same sign: either both positive or both negative).  Sketch a diagram and include the force vectors.
  2. Describe the similarities and differences in the force vectors on each particle.
  3. Reset the animation and create two charges of different magnitude and opposite polarity.  Sketch a diagram including the force vectors.
  4. Describe the similarities and differences in the force vectors on each particle.

Pre/Post Test Questions:

Two small objects each with a net charge of +Q exert a force of magnitude F on each other. 

5. The picture below shows a particle (labeled B) which has a net electric charge of +1 unit.  Several centimeters to the left is another particle (labeled A) which has a net charge of -2 units.  Choose the pair of force vectors (the arrows) that correctly compare the electric force on A (caused by B) with the electric force on B (caused by A).

 

We replace one of the objects with another whose net charge is +4Q:

1. The original magnitude of the force on the +Q charge was F; what is the magnitude of the force on the +Q now?

2. What is the magnitude of the force on the +4Q charge?

(a) 16F (b) 4F (c) F (d) F/4 (e) other

 

 

Original problem: Illustration 22.1 Physlet Physics by Christian and Belloni
© 2004 by Prentice-Hall, Inc. A Pearson Company