Three point charges are placed at the vertices of an equilateral triangle. Find

Question

Three point charges are placed at the vertices of an equilateral triangle. Find the magnitude of the electric field vector ||E rightarrow|| at P. The value of the Coulomb constant is 8.9875 times 109 N middot m2 / C2. Answer in units of N / C A 3.71 mu C charged 1.23 g cork ball is suspended vertically on a 0.571 m long light string in the presence of a uniform downward-directed electric field of magnitude 4.23 times 105 N / C. If the ball is displaced slightly from the vertical, it oscillates like a simple pendulum. Find the period of oscillation. The Coulomb constant s 8.98755 times 109 N middot m2 / C2

Explanation / Answer

1)E= kQ/r^2
E = 8.89 x 10^9
at p E= k(-0.2-0.2)/1.8^2 + K(-0.2)/3.11^2

= 1.11 X 10^9 + 1.86 X 10^9 =2.97 X 10^9

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