Potential difference between two points?

  • Thread starter bigbird24
  • Start date
  • #1
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This is a question from my highscool gr12 physics class
Q) Two parallel plates are 8cm apart and are appositely charged. The electric potential difference across the plates is 160V. Point A is 2cm from the positive plate, point B is 3 cm from the negative plate.
-What is potential difference between points A and B

My attempt-
Electric field intensity: E=[tex]\Delta[/tex]V/d = 160/0.08 =2000N/C
[tex]\Delta[/tex]Va =E*d ---What value for d do i use?
[tex]\Delta[/tex]Vb =E*d ---What value for d do i use?
[tex]\Delta[/tex]Vab = [tex]\Delta[/tex]Vb - [tex]\Delta[/tex]Va
 

Answers and Replies

  • #2
1,255
3
because you're looking for potential difference you don't need to calculate the reference voltages at a and b independently. What if you just used
[tex]
E = d \Delta V
[/tex]
straight from a to b?
 
  • #3
668
0
You don't need formulae, you can do it in your head.

The plates are 8cm apart so at 160V there is a 20 volts per centimetre gradient between them.
The points are 3 cm apart so the answer is 60 volts.
 
  • #4
2
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thanks AJ, that makes sense to me
 

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