An electron is released from rest at a distance of $$\(r_{1}\)$$ from a proton. What is the kinetic energy of the electron when it is a distance $$\(r_{2}\)$$ from the proton?
A.
0
B.
\(\frac{e^{2}}{4 \pi \varepsilon_{0}}\left(\frac{1}{r_{2}{ }^{2}}-\frac{1}{r_{1}{ }^{2}}\right)\)
C.
\(\frac{e^{2}}{4 \pi \varepsilon_{0}}\left(\frac{1}{r_{1}{ }^{2}}-\frac{1}{r_{2}{ }^{2}}\right)\)
D.
\(\frac{e^{2}}{4 \pi \varepsilon_{0}}\left(\frac{1}{r_{2}}-\frac{1}{r_{1}}\right)\)
E.
\(\frac{e^{2}}{4 \pi \varepsilon_{0}}\left(\frac{1}{r_{1}}-\frac{1}{r_{2}}\right)\)
Exam No：AP Physics C(EM) Practice Test Year：2024 Question No：13
Answer:
D
Knowledge points:
1.1 Electrostatics: Charge and Coulomb’s Law
1.2 Electrostatics: Electric Field and Electric Potential
Solution:
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