p240+jan+9+discussion+problem

p240+jan+9+discussion+problem - positive charges exert on Q...

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21.20 . Two point charges are placed on the x-axis as follows: charge q 1 = 3.96 nC is located at x = 0.200 m, and charge q 2 = 4.97 nC is at x = -0.296 m. (a) What is the magnitude of the total force exerted by these two charges on a negative point charge q 3 = -5.98 nC that is placed at the origin? (b) What is the direction of the total force exerted by these two charges on a negative point charge q 3 = -5.98 nC that is placed at the origin?
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21.22. Two positive point charges q are placed on the y-axis at y = a and y = -a . A negative point charge - Q is located at some point x on the +x-axis. (a) Find the x-component of the net force that the two positive charges exert on -Q . (b) (b) Find the y-component of the net force that the two
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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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p240+jan+9+discussion+problem - positive charges exert on Q...

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