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11th Class Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Question Bank Work, Energy And Power Conceptual Problems

  • question_answer
    By convention, the forces which fall off to zero at large distances, the potential energy at infinity is taken to be zero. With this choice, is the potential energy positive for (a) electron-positron bound state (b) planet- satellite system and (c) electron-electron system?

    Answer:

                    (a) Negative, because of attraction between electron and positron. (b) Negative, because of attraction between planet and satellite. (c) Positive, because of repulsion between two electrons.                


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