A-Level Physics Specification

OCR A H556

Section 6.2.4: Electric potential and energy

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#6.2.4a

electric potential at a point as the work done in bringing unit positive charge from infinity to the point; electric potential is zero at infinity

#6.2.4b

electric potential \(V = \dfrac{Q}{4πε_0r} \) at a distance r from a point charge; changes in electric potential

#6.2.4c

capacitance \(C = 4πε_0R \) for an isolated sphere

Derivation expected from equation for electric potential and \(Q = VC\).

#6.2.4d

force–distance graph for a point or spherical charge; work done is area under graph

#6.2.4e

electric potential energy = \(Vq = \dfrac{Qq}{4πε_0r} \) at a distance r from a point charge Q.