topic 2 - electricity: static electricity Flashcards

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1
Q

What happens when certain insulating materials are rubbed against each other? (2 points)

A
  • They become electrically charged

* Negatively charged electrons are rubbed off one material and on to the other

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2
Q

What happens to the insulating material which gains electrons?

A

It becomes negatively charged.

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3
Q

What happens to the insulating material which gains electrons?

A

It becomes positively charged.

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4
Q

What happens when two electrically charged objects are brought close together?

A

They exert a force on each other.

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5
Q

What happens when two electrically charged objects with the same charges are brought close together?

A

They repel.

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6
Q

What happens when two electrically charged objects with different charges are brought close together?

A

They attract.

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7
Q

What are electrostatic attraction and repulsion between two charged objects an example of?

A

Non-contact forces.

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8
Q

As electric charge on an object increases, what happens to the potential difference between the object and the earth?

A

It increases.

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9
Q

How can electric fields be used to explain a spark in static electricity? (4 points)

A
  • High potential difference between charged object and earth
  • Causes strong electric field
  • Electrons removed from air
  • Air becomes a conductor so current can flow through (this is the spark)
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10
Q

Where are electric fields created?

A

Around any electrically charged object.

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11
Q

Where is an electric field strongest?

A

Close to the charged object.

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12
Q

What happens to an electric field as you get further away from the charged object?

A

It gets weaker.

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13
Q

What happens when a second charged object is placed in an electric field?

A

The object experiences a force.

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14
Q

When the distance between objects in an electric field decreases, what happens to the force between them?

A

It decreases.

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15
Q

How can you show an electric field around an object in a diagram?

A

Using field lines.

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16
Q

For an isolated charged sphere, what direction do electric field lines go?

A

From positive to negative.

17
Q

If field lines on a diagram are closer, what doesthis tell us about the electric field?

A

Is is stronger.