Identical point charges (+20 ?C) are placed at the corners of an equilateral triangle with sides of 2.0-m length. How much external energy is required to bring a charge of 45 ?C from infinity to the midpoint of one side of the triangle?
A. 26 J
B. 16 J
C. 23 J
D. 21 J
E. 12 J
Answer: D
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