A small lead sphere is encased in insulating plastic and suspended vertically from an ideal spring (k = 126N/m) above a table. Fig.16-63 the total mass of the coated sphere is 0.800kg, and its center lies 15.0cm above the tabletop when in equilibrium. The sphere is pulled down 5.00 cm below equilibrium, an electric charge Q = - 3.00 X 10-6 C is deposited on it and then it is released. Using what you know about harmonic oscillation, write an expression for the electric field strength as a function of time that would be measured at the point on the tabletop (P) directly below the sphere.

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10.0 cm 15.0 cm