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+ _ 5.2 Electric Field strength E

+ _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

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Page 1: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

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5.2 Electric Field strength E

Page 2: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

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QUESTION

+

_

-e

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QUESTION

F = E Q so E = ……

F = E Q

-e

+

_

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QUESTION

F = E Q so E = ……

F = E Q

-e

+

_

Page 6: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

QUESTION

F = E Q so E = ……

F = E Q

-e

+

_

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QUESTION

F = E Q so E = ……

F = E Q

-e

+

_

Page 8: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

QUESTION

F = E Q so E = ……

F = E Q

-e

+

_

Page 9: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

QUESTION

F = E Q so E = ……

F = E Q

-e

+

_

Page 10: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

QUESTION

F = E Q so E = ……

F = E Q

-e

+

_

Page 11: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

QUESTION

F = E Q so E = ……

F = E Q

-e

+

_

Page 12: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

QUESTION

F = E Q so E = ……

F = E Q

-e

+

_

Page 13: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

•Charge builds up in the cloud•Electric field strength increases•Electrons are pulled out of air molecules•A massive discharge occurs heating and rapidly expanding the air

Lightning:

Page 14: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

slowly and safely

( thick copper strip )

•Charge builds up in the cloud•Electric field strength increases•Electrons are pulled out of air molecules•A massive discharge occurs heating and rapidly expanding the air

Lightning:

making a lightning strike less likely

Using a Lightning conductor

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Page 17: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e
Page 18: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e
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Page 20: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

Field strength (V/m)

E = V d

A B

Page 21: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

Field strength (V/m)

E = V d

Force on a small + test charge Q in a field of strength E: F = E Q

A B

Page 22: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

Field strength (V/m)

E = V d

Force on a small + test charge Q in a field of strength E: F = E Q

Work done by the field on Q in moving from A to B:

W = F d

A B

Page 23: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

Field strength (V/m)

E = V d

Force on a small + test charge Q in a field of strength E: F = E Q

Work done by the field on Q in moving from A to B:

W = F d = EQ d

A B

Page 24: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

Field strength (V/m)

E = V d

Force on a small + test charge Q in a field of strength E: F = E Q

Work done by the field on Q in moving from A to B:

W = F d = EQ d

A B

But Pd V across the plates: V = W = Q

Page 25: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

Field strength (V/m)

E = V d

Force on a small + test charge Q in a field of strength E: F = E Q

Work done by the field on Q in moving from A to B:

W = F d = EQ d

A B

But Pd V across the plates: V = W = Q

EQd = Q

Page 26: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

Field strength (V/m)

E = V d

Force on a small + test charge Q in a field of strength E: F = E Q

Work done by the field on Q in moving from A to B:

W = F d = EQ d

A B

But Pd V across the plates: V = W = Q

EQd = Q

Page 27: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

Field strength (V/m)

E = V d

Force on a small + test charge Q in a field of strength E: F = E Q

Work done by the field on Q in moving from A to B:

W = F d = EQ d

A B

But Pd V across the plates: V = W = Q

EQd = Q

Ed

Page 28: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

Field strength (V/m)

E = V d

Force on a small + test charge Q in a field of strength E: F = E Q

Work done by the field on Q in moving from A to B:

W = F d = EQ d

A B

But Pd V across the plates: V = W = Q

EQd = Q

Ed

so: E = V d

Page 29: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

Field strength (V/m)

E = V d

Force on a small + test charge Q in a field of strength E: F = E Q

Work done by the field on Q in moving from A to B:

W = F d = EQ d

A B

But Pd V across the plates: V = W = Q

EQd = Q

Ed

so: E = V d

Page 30: + _ 5.2 Electric Field strength E. + _ QUESTIONQUESTION + _ -e

Field strength factors:

* Amount of CHARGE!

* concentration of charge!

Charge concentrates at points/tipsSo field lines concentrate there too.

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+_

5.2 Electric Field strength E

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