Electric Fields Flashcards

1
Q

Describe the shuttling ball experiment

A

see textbook

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2
Q

What is the gold leaf electroscope used for?

A

detecting charge

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3
Q

Draw the electric fields of: two oppositely charged points, a point near a plate, and two oppositely charged plates:

A

see textbook

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4
Q

What is the electric field strength?

A

the force per unit charge on a positive test charge placed at that point.

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5
Q

What is electric potential?

A

work done per unit positive charge on a positive test charge when it is moved from infinity to that position.

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6
Q

How do electric field strength and potential gradient compare?

A

electric field strength is the negative of the potential gradient.

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7
Q

Define Coulomb’s law

A

force is proportional to the product of the charges. inversely proportional to the square of the separation.

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8
Q

What is the change of potential equal to?

A

the area under an electric field strength against distance graph

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9
Q

What are the main differences between gravitational fields and electric fields?

A

gravitational force is attractive only, whereas electric fields can be attractive and repulsive. Gravitational is between any two masses whereas electric is between any two charges.

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