Electric field given by the vector $x^i + y^i$ is present in the XY plane. A small ring carrying charge +Q, which can freely slide on a smooth non conducting rod, is projected along the rod from the point (0, L) such that it can reach the other end of the rod. What minimum velocity should be given to the ring?(Assume zero gravity)

{(\frac{Q L^{2}}{m})}^{\frac{1}{2}}

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2 {(\frac{Q L^{2}}{m})}^{\frac{1}{2}}

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4 {(\frac{Q L^{2}}{m})}^{\frac{1}{2}}

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{(\frac{Q L^{2}}{2 m})}^{\frac{1}{2}}

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Solution

The correct option is D ${(\frac{Q L^{2}}{2 m})}^{\frac{1}{2}}$

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