The potential energy of a system increase if work is done

The potential energy of a system increase if work is done
  1. by the system against a conservative force
  2. by the system against a nonconservative force
  3. upon the system by a conservative force
  4. upon the system by a nonconservative force

Solution

The potential energy of a system increases if work is done by the system against a conservative force. $-\Delta U=W_{\text {conservative face }}$

Asked in: NEET 2011 (Screening)

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