A small lead sphere is encased in insulating plastic
Chapter 21, Problem 21.79(choose chapter or problem)
A small lead sphere is encased in insulating plastic andsuspended vertically from an ideal spring (spring constantk = 126 N/m) as in Fig. 21-71. The total mass of the coatedsphere is 0.650 kg, and its center lies 15.0 cm above a tabletopwhen in equilibrium. The sphere is pulled down 5.00 cmbelow equilibrium, an electriccharge Q = -3.00 X 10-6 C isdeposited on it, and then it isreleased. Using what you knowabout harmonic oscillation, writean expression for the electric fieldstrength as a function of time thatwould be measured at the point onthe tabletop (P) directly below thesphere.FIGURE 21-71 79.
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