A charge of 40 pC is distributed on an isolated spherical conductor that has a 4.0-cm radius. Point A is 1.0 cm from the center of the conductor and point B is 5.0 cm from the center of the conductor. Determine the electric potential difference VA?VB.
A. +1.8 V
B. +29 V
C. +27 V
D. +7.2 V
E. +9.0 V
Answer: A
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