How Much Work Is Needed to Move a Charge Between Two Points?

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To calculate the work needed to move a charge between two points near a point charge, the potential difference between the points must first be determined. The potential at a distance from a charge can be calculated using the equation V = kQ/r, where k is Coulomb's constant, Q is the charge, and r is the distance from the charge. The user is struggling to apply this formula correctly for points A and B, which are at different distances from the charge. The discussion highlights confusion over the appropriate equations and methods to solve the problem. Clarifying the steps and ensuring the correct application of the formulas is essential for finding the solution.
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Homework Statement


Points A and B are 4.8cm and 7.2cm away from a point charge of -6.2\muC at point C. AC and CB are at right angles.

a. How much work must be done in moving a 2.0x10^-12C charge from A to B
b. what is the potential difference between points A and B?

Ive been working at this problem with a friend for about a half hour. I have No idea what to do. Everything we tried failed.
 
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I would answer b) first.
 
i tried that.. but maby iwas using the wrong equation. Which equation should i be using?
 
The one which tells you the potential at distance r from a charge Q
 
so V=kq/r. I tried this. It did not work.
 

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