1.

A point mass m and charge q is connected with massless spring of natural length L. Initially spring is in its natural length. If a horizontal uniform electric field E is switched on as shown in figure, then the maximum separation between the point mass and the wall is: (Assume all surface are frictionless) A. `L +(2qE)/(K)`B. `L+(qE)/(K)`C. LD. None of these

Answer» Correct Answer - A
`(1)/(2)Kx^(2) = (qE)x`
`x = (2qE)/(K)`
`:. x_(max) = L +(2qE)/(K)`


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