p240+jan+9+discussion+problem

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

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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 θ is small, and find the equilibrium separation d between the spheres (Hint: If θ is small, then sin( θ ) = tan( θ ) = θ )...
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p240+jan+9+discussion+problem - positive charges exert on...

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