A proton is released from rest at point where the electric potential is and moves to…

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

Problem

A proton is released from rest at point

A

where the electric potential is

500\,\text{V}

and moves to point

B

where the potential is

200\,\text{V}

. Neglecting any non-electrostatic forces, determine the speed of the proton when it reaches

B

. (Take

e=1.6\times10^{-19}\,\text{C}

and

m_p=1.67\times10^{-27}\,\text{kg}

.) (a)

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

(b)

7.6\times10^{4}\,\text{m s}^{-1}

(c)

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

(d)

1.0\times10^{7}\,\text{m s}^{-1}