Three point charges, two positive and one negative, each having a magnitude of 20 ?C are placed at the vertices of an equilateral triangle (30 cm on a side). What is the magnitude of the electrostatic force on the negative charge?
A. 80 N
B. 40 N
C. 69 N
D. 57 N
E. 75 N
Answer: C
Physics & Space Science
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