Point charges of 4.0 × 10-8 C and -2.0 × 10-8 C are placed 12 cm apart. A third point charge of 3.0 × 10-8 C halfway between the first two-point charges experiences a force of magnitude
A) 4.5 × 10-3 N.
B) 2.0 × 10-3 N.
C) 1.5 × 10-3 N.
D) zero.
E) 5.0 × 10-3 N.
Correct Answer:
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