3.7.3 - Electric Fields Flashcards

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1
Q

What can we treat air the same as when using the electrostatic force equation?

A

a vacuum

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2
Q

Where can charge be assumed to act?

A

at the centre of the sphere

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2
Q

What force is the magnitude of electrostatic force between subatomic particles greater than? Why?

A

the magnitude of gravitational forces
the masses are very small but the charges are much bigger

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3
Q

When is a uniform field formed?

A

Between two parallel charged plates

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3
Q

What does the electric field around a negative charge look like?

A

straight lines with arrows pointed towards the centre of the sphere

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4
Q

What does the electric field around a positive charge look like?

A

straight lines with the arrows pointed away from the centre of the sphere

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5
Q

What does the electric field between two parallel (+ve and -ve) plates look like?

A

Straight lines hitting the plates perpendicular, arrows going towards the -ve plate

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6
Q

What does the magnitude of electric force depend on in a radial field?

A

the distance between the two charges

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7
Q

How do we find out the charge of a particle?

A

Using two parallel plates (one +ve and one -ve), fire the particle at right angles to the field and observe the path. A charge particle will experience a constant electric force, causing it to accelerate to follow a parabolic shape towards the plate with an opposite charge.

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8
Q

When is the magnitude of electric potential is greatest?

A

at the surface of the charge

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9
Q

When is electrical potential at 0

A

at infinity

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10
Q

When is potential positive? Why?

A

When the charge is positive
work is done against the field since there is a repulsive force

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11
Q

When is potential negative? Why?

A

When the charge is negative
work is done by the field due to the attractive force

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12
Q

What is the gradient of a potential against distance graph equal to?

A

electric field strength, E

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13
Q

What happens when moving along an equipotential?

A

No work is done

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14
Q

What do equipotential surfaces look like between two parallel charged plates?

A

parallel to the plates

15
Q

What do the equipotential surfaces around a point charge look like?

A

concentric circles

16
Q

What is the area under the graph equal to on a graph of electric field strength against distance

A

the electric potential difference

17
Q

What is unique about electric field strength?

A

it’s a property of the field at that point - not affected by the moving small test charge

18
Q

What is an electrical conductor? What does this mean (field lines)?

A

an equipotential surface
field lines always meet conductors at right angles