P3.1 Static and Charge Flashcards

1
Q

What can happen when insulating materials are rubbed together?

A

They become statically/electrically charged

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2
Q

Why can insulators become electrically charged when rubbed together?

A
  • Electrons are rubbed from one material onto the other
  • The material gaining electrons becomes negatively charged
  • The material losing electrons becomes positively charged
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3
Q

What is charging?

A

The addition or removal of electrons from a material

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4
Q

How can charge be detected?

A

Using a gold leaf electroscope; the gold leaf is repelled by positive charge.

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5
Q

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

A

They exert a force on each other

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6
Q

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

A

They exert an attractive force on each other and attract

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7
Q

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

A

They exert a repulsive force on each other and repel.

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8
Q

Why are most bodies neutrally charged?

A

They have an equal amount of protons and electrons

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9
Q

Give an example of a non-contact force

A

The repulsive or attractive force between two oppositely charged objects

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10
Q

What is an electric field

A

A region in which a charged object will experience a non-contact electrical force

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11
Q

Where can electric fields be found?

A

Surrounding any charged object

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12
Q

Describe the electric field around a charged particle.

A
  • Strongest closest to the object

- Decreases in strength as you move away from the object

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13
Q

What happens to the force between two charged objects when they are moved closer together?

A

The force between them becomes stronger as the separation reduces.

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14
Q

In situations where sparks are unwanted, what precaution must be taken to prevent the build up of static charge?

A

Any surfaces that are rubbing against each other should be earthed to allow the materials to discharge.

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15
Q

What is electric current?

A

The flow of electric chaarge

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16
Q

State the equation linking charge, current and time. Give units for the qunatities involved.

A

Q = I T

Charge (C) = Current (A) x Time (s)

17
Q

What can be said about the value of current at any point in a single closed loop?

A

Current is the same at all points in a closed loop