PhysicsLAB Resource Lesson
Coulomb's Law: Beyond the Fundamentals

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In this lesson we will look at more advanced problems beyond the basic proportional relationships we have already studied using Coulomb's Law,
 
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Refer to the following information for the next three questions.

Three point charges are placed along the x-axis. A +5 µC charge is located at the origin, a +2 µC charge is located 30 cm to its right, and a  -4 µC is located at 50 cm.
 Calculate the magnitude and direction of the force exerted on the +2 µc charge by the +5 µC charge.

 Calculate the magnitude and direction of the force exerted on the +2 µc charge by the -4 µC charge.

 What is the magnitude and direction of the net force on the +2 µC charge?

Refer to the following information for the next four questions.

Two point charges are placed along the x-axis. A +5 µC charge is located at the origin and a  -4 µC is located at 50 cm. Our task is to determine where the +2 µC charge could be placed so as to feel no electrostatic force.
 Why should the +2 µC charge be placed to the right of the -4 µC charge and not to the left of the +5 µC charge?

 Develop and expression for the magnitude of the force exerted on the +2 µc charge by the -4 µC charge.

 Develop an expression for the magnitude of the force exerted on the +2 µc charge by the +5 µC charge.

 What value(s) of x will place the +2 µC charge in equilibrium?

Refer to the following information for the next six questions.

Examine the following diagram which shows four charges that have been placed on the corners of a square 50 cm on each edge. Our task is to determine the net force on the 2 µC charge.
 Sketch in the forces acting on the 2 µC charge.

 Calculate the magnitude and direction of F3,2.

 Calculate the magnitude and direction of F5,2.

 Calculate the magnitude and direction of F-4,2.

 Calculate the net force on the 2 µC charge in both the x-direction and the y-direction.

 Calculate the final magnitude and direction of the force on the 2 µC charge.




 
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