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9 Cards in this Set
- Front
- Back
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Why must a conductor be isolated from the earth before it can be charged? |
Electrons would be transferred to/from the Earth in order to discharge/neutralise it. |
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Why are polythene and perspex easy to charge? |
Their surface atoms easily gain / lose electrons |
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Explain how a current is formed with this circuit. |
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Define electric field strength |
The force per unit charge on a positive test charge at that point. |
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Unit of electric field strength? |
NC^-1 |
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What two things affect electric field strength? |
- Size of charge - Concentration of charge |
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Define electric potential |
The work done per unit positive charge on a positive test charge to move it from infinity to that point. |
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What's the formula for electric potential? |
V=Ep/Q |
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What's the formula for potential gradient? |
∆V/∆x |
