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Scalar and vector potentials in electromagnetism. The scalar potential is potential energy per unit charge. For potential energy, use the [potential-energy] tag.
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Restriction to a region of potential energy [closed]
A particle with total energy E is moving in a potential energy region U(x). Motion of the particle is restricted to the region when?
(A) U(x) > E.
(B) U(x) < E.
(C) U(x) = 0.
(D) U(x) ≤ E. …