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Chapter 16. Charge and Field:

Electric Fields
All charged objects have a field around them. Any charged object within this field will be
either attracted or repelled depending on the charges of the 2 objects.
kQq
You can work out the force acting upon the objects using Coulomb's Law ,…

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Electrical Potential
Electrical potential (V) is the amount of electrical potential energy for each unit of charge.
E kQ
V elec = elec = . Electrical potential (V) is measured in Volts.
q r

Uniform Fields
A uniform field, is different to a radial field as, the field strength, is…

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Charged Particles in a Magnetic Field
Current in a wire is the flow of charged electrons, which, like any charged particles, are
effected by a magnetic field. Current (I) is the amount of charge passing through a wire,
Q
per second. I = .
t
Previously we derived, F =…

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Relativity
As shown above, a 5MeV particle would, without relativity, go faster than the speed of
light. To take relativity into account we use Einstein's definitions for momentum and kinetic
dx
energy. Firstly momentum, p = m . However, if instead we consider wristwatch time, ,
dt
dx
the time…

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