A proton is fired directly toward a fixed point charge of that is located in free space

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A proton is fired directly toward a fixed point charge of

+2\,\mu\text{C}

that is located in free space. If the proton starts from rest at a very great distance, the minimum initial speed it must have so as to reach a point

0.50\,\text{m}

from the charge is closest to (a)

8.3\times10^{6}\,\text{m\,s}^{-1}

(b)

2.6\times10^{6}\,\text{m\,s}^{-1}

(c)

3.7\times10^{6}\,\text{m\,s}^{-1}

(d)

8.3\times10^{5}\,\text{m\,s}^{-1}