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Static Electricity
Question | Answer |
---|---|
What material becomes negatively charged when rubbed? | Polythene |
What material becomes positively charged when rubbed? | Cellulose acetate |
What is a conductor? | A substance through which electric charge may flow |
What is an insulator? | A substance through which electric charge cannot flow |
Where does static charge accumulate? | Where the conductor is most pointed |
State Coulomb's law. | The point of attraction or repulsion between two points is directly proportionate to the product of the charges and inversely proportionate to the square of the distance between them. |
What is an electric field? | Any region of space where a static electric charge experiences a force other than gravity |
What is the line of force? | A line drawn showing the direction of the force |
Name three applications of electric fields. | Photocopying, electrostatic precipitators, and damaging integrated circuits |
Define electric field strength. | The force per unit charge at a given point |
What is the unit of electric field strength? | Newton per coulomb/ Volt per meter |