The electric P.E of an electron in an orbit at a distance rn from the positive charge_____________?
Correct answer: C. ÀKe2/rn
- A. Ke2/rn
- B. Ke2/rn2
- C. ÀKe2/rn
- D. ÀKe2/rn2
Explanation
The electric potential energy of two opposite charges is U = kq1q2/r. For an electron and a positive charge, q1q2 is negative, giving U = -Ke²/rn, represented by option c. The likely mistake is choosing Ke²/rn, which ignores the negative sign associated with attraction.
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About Electric Potential
Electric potential is the work done per unit positive charge in bringing it from infinity to a point, while potential difference compares energy change between two points. Work includes potential due to point charges, superposition of scalar potentials, equipotential surfaces, and the relation between electric field and potential.
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