PhysicsLAB Worksheet
Electrostatic Forces and Fields: Point Charges

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Refer to the following information for the next eight questions.

Three point charges are placed along the x-axis: +20 µC at x = 0, -15 µC at x = 2, and +30 µC at x = 3.5.
 
Part I: What is the magnitude of the net force acting on the -15 µC charge located at x = 2 by the other two charges? 

What is the direction of the net force on the -15 µC charge at x = 2? 

What is the magnitude of the net electric field due to the other two charges at the -15 µC charge's location at x = 2? 

What is the direction of the net electric field at x = 2? 

Part II: What is the magnitude of the net force acting on the +30 µC charge located at x = 3.5 by the other two charges? 

What is the direction of the net force on the +30 µC located at 3.5? 

What is the magnitude of the net electric field due to the other two charges at the +30 µC charge's location, x = 3.5? 

What is the direction of the net electric field at x = 3.5? 

Refer to the following information for the next eight questions.

Two point charges are placed along the x-axis: +20 µC at x = 0 and -15 µC at x = 2. A third charge of +30 µC is located at y = 1.5.
 
Part III: What is the magnitude of the net force acting on the +30 µC charge by the other two charges? 

What is the direction of the net force on the +30 µC charge at y = 1.5? 

What is the magnitude of the net electric field due to the other two charges at the +30 µC charge's location, y = 1.5? 

What is the direction of the net electric field at y = 1.5? 

Part IV: What is the magnitude of the net force acting on the -15 µC charge, located at x = 2, by the other two charges? 

What is the direction of the net force on the -15 µC charge at x = 2? 

What is the magnitude of the net electric field due to the other two charges at the -15 µC charge's location, x = 2? 

What is the direction of the net electric field at x = 2? 




 
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