- #1
hardwork
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When using e (for electron) in a formula, do you use +1.6x10^-19 C or -1.6x10^-19 C?
For example:
http://i44.tinypic.com/25g9te8.jpg
An electron moved from c to a. How much work is done by the electric force?
Electric Potential
Point a = 6.2x10^5 V
Point c = -7.5x10^4 V
Work = (-1.6x10^-19 C) (Va - Vc) = -1.1x10^-13
-W(electric force) = +1.1 x 10^-13
OR
Work = (1.6x10^-19 C) (Va - Vc) = 1.1x10^-13
-W(electric force) = -1.1 x 10^-13
For example:
http://i44.tinypic.com/25g9te8.jpg
An electron moved from c to a. How much work is done by the electric force?
Electric Potential
Point a = 6.2x10^5 V
Point c = -7.5x10^4 V
Work = (-1.6x10^-19 C) (Va - Vc) = -1.1x10^-13
-W(electric force) = +1.1 x 10^-13
OR
Work = (1.6x10^-19 C) (Va - Vc) = 1.1x10^-13
-W(electric force) = -1.1 x 10^-13