Topic 1: Charges & Forces Flashcards Preview

EE20085 Electromagnetics > Topic 1: Charges & Forces > Flashcards

Flashcards in Topic 1: Charges & Forces Deck (12)
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1

How was coulombs law derived? What does it show?

Coulomb’s law, derived experimentally in 1785, gives the electrostatic force between two charges.

2

Diagram and equation for Coulomb's law? 

3

Description of Coulomb's law equation? 

4

The permittivity of free space?

5

The elementary charge?

1.60217733´10-19 C

6

The Scalers and vectors present in Coulomb's law?

F12 & r21 are vectors.

They have magnitude and direction. 

 

r21 is a unit vector, unit magnitude

(The Hat means magnitude) 

 

Note: F12 = -F21

7

In coulombs law the Force and charge are related......

Related by the inverse square. 

8

What happens when many forces are present

With many charges present (distribution) then the resultant forces must be added vectorially. The resultant force, F0 is:

9

The equation for Superposition of charges via coulombs law? 

10

Finding the force exerted on a charge Q0 on the axis of a charged ring of radius R.

The equation for an elemental charge:

11

Finding the force exerted on a charge Q0 on the axis of a charged ring of radius R.

The force that this elemental charge exerts on Q0 is

12