Question

Coulomb’s Law

A massless sphere of charge q1 = 0.640 µC is at the end of a spring in equilibrium as shown below in figure a. When a charge q2 = -0.410 µC is held beneath the positively charged sphere as shown in figure b, the spring stretches by a distance d = 3.60 cm from its position in figure a. When equilibrium is reestablished, the distance r between the charges is 5.20 cm. What is the spring constant of the spring? The spring force and the electric force are the only relevant forces in this problem.

Y1 1

__A small spherical ball of mass 38.0 grams and charge 0.500 μC is hung by a thin wire of negligible mass. A charge of -0.950 μC is held 0.150 m away from the hanging sphere and directly to the right of it, so the wire makes an angle θ with the vertical as shown below. Find (a) the angle θ and (b) the tension in the wire. Only gravity, tension and the electric force are relevant for this problem.

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Answer 1