1. An electron (q =-1 .6 x 10 19 C ) is placed at the origin in a region where t
ID: 3308156 • Letter: 1
Question
1. An electron (q =-1 .6 x 10 19 C ) is placed at the origin in a region where the electric potentia nceases in e ty diection, but does hange in the x or z directions e electron, initially at rest, is acted on only by the electric force and moves from point A to point B, increasing its kinetic energy by 6.8 x 10'1 J. In what direction and through what potential ifference V, V, does the electron move? (b) What is the change in the electron's potential energy in going from A to B? (c) If the electron moves only in the +x direction by 0.5 m, what will be its change in potential energy?Explanation / Answer
1. (A) KE = q deltaV
6.8 x 10^-18 = (1.6 x 10^-19) (VB - VA)
VB - VA = 42.5 Volt
(B) change in PE = q deltaV
= - 6.8 x 10^-18 J
(3) potential does not change in x or z direction.
change inPE = 0
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