Physics Unit 4 - Electric fields

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What is an electric field?
A region of space which will produce a force on a charged particle
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When will a charged particle experience a force?
In an electric field
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If the electric field lines are close together, is the field strong or weak?
Strong
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What are the 2 units for the electric field strength?
NC^-1 and Vm^-1
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How can you investigate an electric field?
Using a power supply to provide a p.d and caster oil with floating semolina to show the field lines
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As you move through an electric field, what changes?
The electric potential
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What direction does an electric field travel?
Positive to negative
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Where is charge particularly concentrated?
In regions around spikes or points on charged objects
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What is the permittivity of free space?
A measure of how easy it is for the electric field to travel through space
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How can you investigate coulombs law?
Using an electric balance. Charge a pair of insulated spheres, clamp them close together, causes a force. Adjust the distance. Inverse square law
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What is an electron volt?
A unit of energy equal to the work done on an electron in accelerating it through a p.d of 1 volt
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What is the charge of an alpha particle?
Twice the charge of an electron
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Explain what happens when an electron starts to approach the speed of light?
The kinetic energy increases, but it is the mass that increases not the speed
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Other cards in this set

Card 2

Front

When will a charged particle experience a force?

Back

In an electric field

Card 3

Front

If the electric field lines are close together, is the field strong or weak?

Card 4

Front

What are the 2 units for the electric field strength?

Card 5

Front

How can you investigate an electric field?