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Unformatted text preview: positive charges exert on Q . (c) What is the net force on the charge Q when it is at the origin x =0? (d) Graph the x-component of the net force on the charge Q as a function of x for values of x between -4 a and +4 a . 21.74. Two identical spheres with mass m are hung from silk threads of length L , as shown in the figure Each sphere has the same charge, so q 1 = q 2 = q . The radius of each sphere is very small compared to the distance between the spheres, so they may be treated as point charges. Suppose that the angle is small, and find the equilibrium separation d between the spheres (Hint: If is small, then sin( ) = tan( ) = )...
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