PHYS 102 Final: Equations
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Where q = charge on object, r = distance in between, k = proportionality constant = 9 x 109 n m2/c2. Ele(cid:272)t(cid:396)i(cid:272) field fo(cid:396)(cid:373) of coulo(cid:373)(cid:271)"s la(cid:449): (electric field at a distance r from a single point charge q) Notice that e is independent of the test charge q. If q is positive, f and e point in the same direction. If q is negative, f and e point in opposite directions. The electric field e due to a positive charge points away from the charge, whereas e due to a negative charge points toward that charge. Work w done by the electric field e to move the charge a distance d: If a positive test charge q in an electric field has electric potential energy pea at some point a (relative to some zero-potential energy), the electric potential va at this point is:
