Three 2.50-?C charges are placed on tiny conducting spheres at the ends of 1.00 m-long strings that are connected at 120° angles as shown below. The magnitude, in N, of the force on the knot at the center is
?
?
A. 0.
B. 3.75 × 10?2.
C. 5.63 × 10?2.
D. 6.50 × 10?2.
E. 7.50 × 10?2.
Answer: A
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