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April 19, 2014

April 19, 2014

Posted by **Samantha** on Monday, February 25, 2008 at 12:55am.

This is what I did. V=PE/q' so V is proportional to the distance. Since point 2's horizontal distance is 4 times greater. I multiplied point 1's 1200V by 4. But it was wrong. How do I get the correct answer?

- physics -
**Samantha**, Monday, February 25, 2008 at 1:05amI saw that electric field has unit of V/m, so also tried doing (9m X 53V/m)+1200V but still wrong!

- physics -
**drwls**, Monday, February 25, 2008 at 1:23amWith the E-field along the x axis, electrical potential is independent of y. Between the two points 1 and 2, x changes by 9 meters. Since E = -dV/dx = 53 V/m, the potential is changed by -9x53 = -477 V at point 2. That makes it 1200 - 477 = 723 v there.

You were on the right track with your answer, except for the minus sign. The relationship of E to V is

E = -dV/dx (if E is along the x direction).

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