What is the potential difference VA-VB?

  • Thread starter hoseA
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  • #1
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Points A (3 m, 2 m) and B (6 m, 6 m) are in a
region where the electric field is uniform and
given by E = Exi + Eyj, where Ex = 3 N/C
and Ey = 2 N/C.
What is the potential difference VA-VB?
Answer in units of V.

I used E(rB-rA)

sqr rt(13) times (sqr rt (72) - sqr rt (13)) = 17.59

this is wrong. What am i doing wrong?
 

Answers and Replies

  • #2
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Given the field do you know how to calculate the potential (difference) in terms of a line intergral?
 
  • #3
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neutrino said:
Given the field do you know how to calculate the potential (difference) in terms of a line intergral?

help within the hour is much appreciated... I'm thinking maybe it should be negative?
 
  • #4
nrqed
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hoseA said:
help within the hour is much appreciated... I'm thinking maybe it should be negative?

For a uniform E field, the potential difference is given by a scalar product (NOT a product of magnitudes!), [tex] \Delta V = - \vec E \cdot \vec r[/tex]

Pat
 

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