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May 26, 2015

Homework Help: Physics

Posted by Crystal on Thursday, February 3, 2011 at 3:31pm.

Twelve identical point charges are equally spaced around the circumference of a circle of radius 'R'. The circle is centered at the origin. One of the twelve charges, which happens to be on the positive axis, is now moved to the center of the circle.

Part A
Find the magnitude of the net electric force exerted on this charge.
Express your answer in terms of some or all of the variables q, R, and appropriate constants.

Part B
Find the direction of the net electric force exerted on this charge.
Express your answer as an integer. (in degrees counterclockwise from the positive x axis).

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