A positively charged sphere of mass m=5kg is attached by a spring of force cons†an t K=10^4N/m. The sphere is tied with a thread so that spring is in its natural length. Another identical, negatively chatged sphere is fixed with floor, vertically below the positively charged sphere. If initial separation between sphere is r_0=50cm and magnitude of charge on each phere is q=100microcoulomb, calulate maximum elongation of spring when the thread is burnt. Take g=10m/s^2.

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