Potential Multiple Choice

  • Thread starter wolski888
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  • #1
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Homework Statement


Charge Q is located at the (x,y) origin. q is a distance r in the +x direction from Q. 2q is a distance 2r in the +x direction from Q. Which of q or 2q is at a higher potential? q, 2q, or same.

The Attempt at a Solution


I am thinking that it would depend on Q. Q=0, then the higher potential is at q. But if it wasn't =0? The fact that 2q and q impact each other's potential also makes this problem difficult. Any thoughts?
 

Answers and Replies

  • #2
798
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We know that [tex]V=\frac{kq}{R}[/tex], correct? Do all potential calculations at the origin. For example, measure the potential due to q, and 2q at the origin where Q is located.

What do you get?
 
  • #3
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Wouldn't it be the same for 2q and q? But if you mean add them together than V = kq(squared) / r. No?
 
  • #4
798
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Does the question indicate whether Q is positive or negative?
 
  • #5
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No, it does not.
 
  • #6
798
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The sign of Q is the determining factor in this situation.
 
  • #7
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Then what would be the answer for both cases?
 

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