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  4. Apositively charged ring is in y-z plane with its centre at origin. Apositive test charge q0, held at origin is released along x-axis, then its speed

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Q. Apositively charged ring is in $y-z$ plane with its centre at origin. Apositive test charge $q_{0}$, held at origin is released along $x$-axis, then its speed

Electrostatic Potential and Capacitance

Solution:

image
$V=\frac{k q}{\sqrt{x^{2}+a^{2}}}$
$V$ decreases
So, $U$ decreases
So, $K$ increases