The figure shows two tiny 5.0-g spheres suspended from very light 1.0-m-long threads.The spheres repel each other after each one is given the same positive charge and hang at rest when θ = 4.1°.What is the charge on each sphere? (k = 1/4πε0 = 9.0 × 109 N ∙ m2/C2) 
A) 22 nC
B) 89 nC
C) 360 nC
D) 180 nC
E) 45 nC
Correct Answer:
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