A-Level Physics OCR A H556

6.2.4: Electric potential and energy

#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.

6.2.3

Uniform electric field

6.3.1

Magnetic fields