When two protons are brought together_____________________?
Correct answer: B. P.E. between them increases
- A. Kinetic energy increases
- B. P.E. between them increases
- C. P.E. between them decreases
- D. P.E. between tem does not change
Explanation
The electric potential energy of two like charges is U = kq1q2/r. Since both particles are protons and r decreases, their positive potential energy increases. A student may choose c by thinking that bringing charges closer reduces energy, but that applies to opposite charges, not two like charges.
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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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