20 2 coulomb s law
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20-2 Coulomb’s Law. q 1 q 2. F e = k c. r 2. 20-2 Coulomb’s Law. 1780’s Charles Coulomb was experimenting to find how charges create forces The force depends on Charges Distance He found this relationship. k c = Coulomb’s Constant k c = 8.99x10 9 Nm 2 /C 2. 20-2 Coulomb’s Law.

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20-2 Coulomb’s Law

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20 2 coulomb s law

20-2Coulomb’s Law


20 2 coulomb s law1

q1q2

Fe = kc

r2

20-2 Coulomb’s Law

1780’s

Charles Coulomb was experimenting to find how charges create forces

The force depends on

  • Charges

  • Distance

    He found this relationship

kc = Coulomb’s Constant

kc = 8.99x109 Nm2/C2


20 2 coulomb s law2

20-2 Coulomb’s Law

The elementary charge of both protons and electrons are the same. One is + and one is -

q = 1.60x10-19 C

This is the smallest possible charge. When a particle is charged, it is always a multiple of this number.

(It is QUANTIZED)


20 2 coulomb s law3

n +

+ n

e-

20-2 Coulomb’s Law

Find the force between the nucleus and an electron and an helium atom if they are separated by 1.00 nm (remember that n=nano=10-9).

q1 = 2(1.60x10-19) C

q2 = 1.60x10-19 C


20 2 coulomb s law4

1

2

3

2 m

1 m

q1 = - 6 mC

q2 = +2 mC

q3 = - 3 mC

1

3

What would change if this were the original orientation?

2

20-2 Coulomb’s Law

Find the net force on q3


20 2 coulomb s law5

1

2

3

2 m

x

q1 = - 6 mC

q2 = +2 mC

q3 = - 3 mC

20-2 Coulomb’s Law

What is the value of x if q2 is in equilibrium?


Conductors and insulators

Conductors and Insulators

Conductors – any material that allows charges to flow through it easily.

examples:

Insulators – a material that does not allow charges to move.

examples:

Both can be charged. It is the movement of charges that makes them different.


Electroscope

Electroscope

Charging by Conduction

Objects touch and transfer charges. The object will acquire the same charge as the original charge.

Charging by Induction

Objects do not touch. The object is grounded while a charge is brought close. The object will acquire the opposite charge.


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