A positively charged sphere of mass m = 5kg is attached by a spring of force constant `K = 10^(4)` N/m. The sphere is tied with a thread so that spring is in its natural length. Another identical, negatively charged sphere is fixed with floor, vertically below the positively charged sphere as shown in fignre. If initial separation between sphere is `r_(0)` = 50cm and magnitnde ofcharge on each sphere is `q = 100muC`, calculate maximum elongation of spring when the thread is burnt. Take `g= 10 m//s^(2)` :

Answer

[10cm]