Q- Two charges placed on the x axis. Qa = 4 µC at x = 0 and Qb = - 4 µC at x = 22cm.
(a) Find the net electric field at point P at x = - 6 cm.
(b) Find the force on Qb due to Qa .
(c) The charges Qa and Qb are now attached to the ends of a spring whose un-stretched length is s0 = 22 cm and released. With the charges attached, the spring compresses to an equilibrium length s1 = 12 cm. Calculate the spring constant ks of the spring.
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