The potential energy of a system increases if work is done (a) upon the system by a nonconservative force (b) by the system against a conservative force. (c) by the system against a nonconservative force. (d) upon the system by a conservative force.

Answer: (b). Δ U = -Wconservative. When the system does work against a conservative force, that force does negative work, so Δ U > 0. So the answer is (b).

The potential energy of a system increases if work is done | NEET 2011 (AIPMT, Prelims)

Q12NEET 2011 · AIPMT · PRELIMSEasy

Potential Energy & Equilibrium

The potential energy of a system increases if work is done

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Answer: (b)

$\Delta U = -W_{conservative}$ .
When the system does work against a conservative force, that force does negative work, so $\Delta U > 0$ .
So the answer is (b).

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