2) Initially both a small pith ball, with a conductive coating, that hangs from

ID: 2269831 • Letter: 2

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2) Initially both a small pith ball, with a conductive coating, that hangs from a string and a glass rod are neutral. The pith ball is rubbed against the rod with enough friction to charge both objects. a) How should the charge state of the pith ball compare to the charge state of the rod after the two objects are rubbed together. Explain your reasoning. b) The charged pith ball ball is then brought into contact with a second identical and initially uncharged pith ball. After touching the two pith balls repel and when placed so that their centers are 5 cm apart the repulsive force is measured to be 0.006 N. Use this information to determine the amount of excess charge on the rod. c) Consider a system consisting of the charged rod and either of the charged pith balls (after they

Explanation / Answer

a) The pith ball will acquire a negative charge ( -Q ) and the glass rod will acquire a positive charge ( + Q )

b) The charge on the two pith balls after contact = -Q/2

so.. force = K*(-Q/2)*(-Q/2) / 0.05^2 = 0.006

9* 10^9 * Q^2 / ( 4 * 0.05^2) = 0.006

so.. Q = 8.165* 10^-8 C

so excess charge on rod = Q = 8.165* 10^-8 C

c) The charge on rod = +Q

charge on ball = -Q/2

so.. net charge of system = Q - Q/2 = Q/2

so.. the net charge is lie the rod

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2) Initially both a small pith ball, with a conductive coating, that hangs from

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2) Initially both a small pith ball, with a conductive coating, that hangs from

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