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Two identical particles of charge `q` each are connected by a massless spring of force constant `k`. They are placed over a smooth horizontal surface. They are released when the separation between them is `r` and spring is unstretched. If maximum extension of the spring is `r`, the value of `k` is (neglect gravitational effect) A. `(q^(2))/(4piepsilon_(0)r^(2))`B. `(q^(2))/(2piepsilon_(0)r^(3))`C. `(q^(2))/(piepsilon_(0)r^(3))`D. none of these |
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Answer» Conservation of energy gives `(q^(2))/(4piepsilon_(0)r)=(1)/(2)kr^(2)+(q^(2))/(4piepsilon_(0).2r)rArrk=(q^(2))/(4piepsilon_(0)r^(3))` |
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