Electric Field and Potential Energy of Two Charges: Explained

AI Thread Summary
The discussion focuses on calculating the electric field and potential energy involving two fixed charges, Q1 and Q2, and a third charge brought to point A. The x-component of the electric field at point A is determined to be negative due to the influence of the negative charge Q1, while the y-component is positive, resulting from the positive charge Q2. The magnitude of the electric field at point A can be calculated using the superposition principle, taking into account both charges. Additionally, the total potential energy of the system, including the third charge, is derived from the interactions between all three charges. Understanding the symmetry and drawing a diagram are suggested as helpful strategies for solving the problem.
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Homework Statement



A negative charge Q1 = -8 nC is fixed on the x-axis at (x = -4, y = 0). A positive charge Q2 = +8 nC is fixed on the x-axis at (x = 4, y = 0). For the sake of reference, consider point A, at (x = 0, y = 5). All locations are in meters.

What is the sign of the x-component of the electric field at A?

What is the sign of the y-component of the electric field at A?

What is the magnitude of the electric field at A?

A third charge (q = 4 nC) is brought in from very far away and put at point A. What total potential energy is stored in all three charges?

Homework Equations





The Attempt at a Solution



I'm reviewing for an exam and I just don't know how to answer these questions. Any explanation would be appreciated. Thank You
 
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Start by drawing it out on paper. Perhaps you will notice some sort of symmetry between the two charges and the point A.
 
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