A-Level Physics OCR B H557

uniform electric field $E = \dfrac{V}{d}$

the electric field of a charged object, and the force on a charge in an electric field; inverse square law for point charge

*Spherically symmetrical charged conductor is equivalent to a point charge at its centre *

electrical potential energy and electric potential due to a point charge; $\dfrac{1}{r}$ relationship

evidence for discreteness of charge on electron

Such as the Millikan oil drop experiment

the force on a moving charged particle due to a uniform magnetic field

similarities and differences between electric and gravitational fields.

Make appropriate use of:

(i) the terms: charge, electric field, electric potential, equipotential surface, electronvolt

by sketching and interpreting:

(ii) graphs showing electric potential as area under a graph of electric field versus distance, graphs showing changes in electric potential energy as area under a graph of electric force versus distance between two distance values

(iii) graphs showing force as related to the tangent of a graph of electric potential energy versus distance, graphs showing field strength as related to the tangent of a graph of electric potential versus distance

(iv) diagrams of electric fields and the corresponding equipotential surfaces.

for radial components $F_{electric} = \dfrac{kqQ}{r^2}$, $E_{electric} = \dfrac{F_{electric}}{q} = \dfrac{kQ}{r^2}$ where $k = \dfrac{1}{4πε_0}$

$E_{electric} = -\dfrac{dV_{electric}}{dr}$, $E_{electric} = \dfrac{V}{d}$ (for a uniform field)

electrical potential energy = $\dfrac{kQq}{r}$, $V_{electric} = \dfrac{kQ}{r}$

$F = qvB$