# Physics electric fields

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• Created by: abbin003
• Created on: 19-12-19 12:42
Define electric field strength
The force experienced per unit positive charge
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State Coulomb's law
Two point charges that exert an electrostatic force on each other that is directly proportional to the product of there charges and inversely proportional to the square of the distance between them
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State an equation for coloumbs law
F=Qq/4πε( epsilon nought) r squared
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What is the electric field strength E at a distance r from the centre of the sphere equal to
The force experienced by a positive 'test' charge divided by the charge q on the test charge
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What is the equation for the card before
E=Q/4 πε( epsilon nought ) r squared
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State the equation for electric field between two parallel plates
E=V/d
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State the equation for capacitance in a parallel plate capacitor in a vacuum
C=ε( epsilon nought) multiplied by Area / d
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What happens to the equation in the card before when an insulator other than a vacuum is used between the plates
You change epsilon nought with the equation epsilon, where epsilon is relative permitivity (ε with r on the bottom right of ε )multiplied by epsilon nought
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What is the work done of an electron moving Between two parallel plates which have a uniform electric field equal to
Work done on an electron= Ve
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What's the equation for acceleration of a charged particle In a uniform field
a=EQ/m
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What is the equation for the vertical velocity of a charged particle in a uniform field
V=EQL/mv ( this is when initial vertical velocity is 0)
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What is the equation for electrical potential energy
E=Qq/4πε(epsilon nought) r
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What is this electrical potential energy also equal to
The total work done
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What does it mean if your electrical potential energy comes out as a negative when using the equation two cards before
It means one of the charges are negative and that it's an attraction
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Define electrical potential
The work done per unit charge in bringing a positive charge from infinity to that point
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State the equation for electrical potential
E=Q/4πε(epsilon nought)r
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What Is the electical potential difference
The work done per unit charge between two points around the charge of particle Q
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What is the equation for capacitance of a charged sphere
C=4πε(epsilon nought)R ( R for radius)
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## Other cards in this set

### Card 2

#### Front

State Coulomb's law

#### Back

Two point charges that exert an electrostatic force on each other that is directly proportional to the product of there charges and inversely proportional to the square of the distance between them

### Card 3

#### Front

State an equation for coloumbs law

### Card 4

#### Front

What is the electric field strength E at a distance r from the centre of the sphere equal to

### Card 5

#### Front

What is the equation for the card before

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