How Is the Normal Force Calculated on a Charged Object on Level Ground?

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Homework Help Overview

The discussion revolves around calculating the normal force acting on a charged object resting on level ground, specifically a small negatively charged object influenced by a nearby positively charged object. The problem involves concepts from electrostatics and mechanics.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the forces acting on the charged object, including gravitational force and electrostatic force. There are questions about how the presence of the upper charge affects the normal force compared to a scenario without it.

Discussion Status

Some participants are exploring the relationship between the gravitational force and the electrostatic force, questioning how the normal force is adjusted in response to these forces. There is an acknowledgment of the direction of the normal force, but no consensus on the overall calculation or implications.

Contextual Notes

The problem explicitly states that gravity should not be ignored, indicating that both gravitational and electrostatic forces must be considered in determining the normal force.

faustud.
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Homework Statement



A small charge of -2 micro-colombs which has a mass of 0.5 kg lies on level ground. A charge of +5 micro-colombs is a distance of 0.35 meters above the charge. What is the magnitude of the normal force in Newtons on the -2 micro-colomb charge? Do not ignore gravity for this problem.


Homework Equations



F_e_=k[(q1q2)/r^2] F_m_=mg

The Attempt at a Solution



F_e_=0.7339 N and F_m_=4.9N

Can anyone tell me if I'm going in the right direction with this problem?
 
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faustud. said:
F_e_=k[(q1q2)/r^2] F_m_=mg

If the upper charge had not been there, then normal reaction at point of contact on the ground would have been the weight mg. Now the upper charge is pulling at it with force F_e. How is the N changed now?
 
The N is in the positive direction, going upward?
 
The normal reaction acting on the body at the point of contact is upward.
 

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