How to Calculate Potential Difference and Electric Field for a Point Charge?

AI Thread Summary
To calculate the potential difference (Vba) between points a and b near a -4.2 µC point charge, the formula Vb - Va = (EPEb/q) - (EPEa/q) can be used. The electric potential energy (EPE) at a point is crucial for simplifying the calculations. The discussion emphasizes the need to determine the electric potential at each point to apply the formula effectively. Additionally, the electric field (Eb - Ea) must be calculated, considering the direction and magnitude. Understanding these concepts is essential for solving the problem accurately.
Mhchurch4
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1. Consider point a which is 70 cm north of a -4.2 µC point charge, and point b which is 74 cm west of the charge (Fig. 17-23).
(a) Determine Vba = Vb - Va.
(b) Determine Eb - Ea.
Magnitude
Direction (counterclockwise from east is positive)


2. Vb-Va=(EPEb/q)-(EPEa/q)



3. I thought I would use that formula since that is what I need, but I don't know how to get V. Please help!
 
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That formula is correct but work simplify it a little bit.

What is the electric potential energy at a point equal to? If you know, then fill that into the formulas you have to simplify. If you can do this you should end up with some workable formulas.
 

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