Two charged small spheres are 20 cm apart and the magnitude of the force of repulsion between them is 4.57 10− ^21 N. If one sphere carries a charge q1 = −1.6 μC, a. What charge (q2) must be present on the other sphere? (5 pts.) b. Is charge q2 positive or negative? How do you know? (2 pts.) c. Find the number of electrons present on q1.

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