# 5.1 Field Patterns

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What makes an electrical conductor?
Something with free electrons.
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Why does something have to be isolated from the Earth before it is charged?
Otherwise electrons would be transferred between the Earth, neutralising the charge.
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Why are some insulators easy to charge?
Their surfaces easily gain or lose electrons.
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What does the shuttling ball experiment show?
That an electric current is a flow of charge.
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What is the setup of the shuttling ball experiment?
A conducting ball is suspended by an insulating thread between two vertical plates.
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What happens when a high voltage is applied to the shuttling ball experiment?
The ball moves back and forth, when it touches the positive plate it loses its electrons so become positive. So it repels, and touches negative plate, and gains electrons and repels, and so on.
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Why does the shuttling ball create a current?
When the electrons are deposited they pass round the circuit to the other plate, where they are picked up again. Therefore the electrons move around the circuit.
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What happens to the current when the plates are closer together?
It increases, as the ball moves back and forth more often, so the electrons are passed around faster.
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What equation governs the current in the shuttling ball experiment?
I = Qf
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What does a gold leaf electroscope do?
Detects charge.
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How does the gold leaf electroscope work?
Charged object is on metal cap = electroscope is charged = the gold leaf repels = gold leaf rises.
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What is an electric field line?
The path a free positive test charge would follow if placed in the field.
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What surrounds each charge?
An electric field.
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What would the concentration of field lines mean?
The magnitude of electric field strength at that point.
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What do parallel field lines show?
A uniform field.
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## Other cards in this set

### Card 2

#### Front

Why does something have to be isolated from the Earth before it is charged?

#### Back

Otherwise electrons would be transferred between the Earth, neutralising the charge.

### Card 3

#### Front

Why are some insulators easy to charge?

### Card 4

#### Front

What does the shuttling ball experiment show?

### Card 5

#### Front

What is the setup of the shuttling ball experiment?

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