A fancy lecture demo designed to gauge electric fields is


A fancy lecture demo designed to gauge electric fields is shown in the figure above. A pith ball of mass 0.510 g and positive charge q = 42.6x10-6 C is suspended on a string of negligible mass in a uniform electric field. We observe that the ball hangs at an angle of Theta=15.0 from the vertical. What is the magnitude of the electric field?

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Physics: A fancy lecture demo designed to gauge electric fields is
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