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A electric charge \( q \), and mass \( m \) is initially at rest. It is at a distance \( r_{1} \) from an infinite plane of positive charge having surface charge density \( \sigma \). If charge is now released, find its velocity at a distance \( r_{2} \) from the plane.
(a) \( \sqrt{\frac{\sigma q}{3 \varepsilon_{0}}\left(r_{2}-r_{1}\right)} \)
(b) \( \sqrt{\frac{\sigma q}{2 \varepsilon_{0}}\left(r_{2}-r_{1}\right)} \)
(c) \( \sqrt{\frac{2 \sigma q}{\varepsilon_{0} m}\left(r_{2}-r_{1}\right)} \)
\( (d) \sqrt{\frac{\sigma q}{\varepsilon_{0} m}\left(r_{2}-r_{1}\right)} \)
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