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"One practical arrangement for verifying Coulomb's law is to use a lightweight, negatively charged, freely-suspended ball. it is repelled by the negative charge on a larger sphere that is held near it, on an insulated support. the small angle of deflection, x is then measured.

The weight of the ball is W. show that the force of repulsion F on the suspended ball is given by:

F = W tan x"

I've drawn a free body force diagram, but i still cant work it out..

help pleaseee

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# Homework Help: Coulomb's law and mechanics

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