Which statement is always correct when applied to a charge distribution located in a finite region of space?
A. Electric potential is always zero at infinity.
B. Electric potential is always zero at the origin.
C. Electric potential is always zero at a boundary surface to a charge distribution.
D. Electric potential is always infinite at a boundary surface to a charge distribution.
E. The location where electric potential is zero may be chosen arbitrarily.
Answer: E
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