$\begin {array} {1 1} (1)\;\sqrt{\large\frac{2mV}{er^2}} & \quad (2)\;\sqrt{\large\frac{2mV}{r}} \\ (3)\;\sqrt{\large\frac{2mVr}{e}} & \quad (4)\;\large\frac{2mV}{{\sqrt{er}}} \end {array}$

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