Electric Field

Card 1: What is electric field?

Electric Field

An electric field exists in a region of space where a small positive charge experiences an electric force.

Card 2: Line of force of an electric field

Line of force

electric field

  1. The direction of the field is defined as the direction of the force on a small positive charge.
  2. Lines of force are used to represent the direction of an electric field.
  3. The lines of force are directed outwards for a positive charge and inwards for a negative charge.
Card 3: Stength of Electric Field

Strength of Electric Field

Strength of Electric Field

The strength of the electric field is indicated by how close the field lines are to each other. The closer the field lines, the stronger the electric field in that region.

Card 4: Field Pattern of 2 Point Sources

Field Pattern of 2 Point Sources

Card 5: Some other electric field patterns

electric field

electric field

 

Card 6: Effect of Electric Field 1 - Ping Pong Ball in an Electric Field

Ping Pong Ball in an Electric Filed

ping pong ball in an electric field The ball will still remain stationary. This is because the force exert on the ball by the positive plate is equal to the force exerted on it by the negative plate.
ping pong ball in an electric field If the ping pong ball is displaced to the right to touch the positive plate, it will then be charged with positive charge and will be pushed towards the negative plate.
ping pong ball in an electric field When the ping pong ball touches the negative plate, it will be charged with negative charge and will be pushed towards the positive plate. This process repeats again and again, causes the ping pong ball oscillates to and fro continuously between the two plates.
Card 7: Effect of Electric Field 2 - Candle in an Electric Field

Candle in an Electric Field

candle flame in an electric field The heat of the candle flame removes electrons from the air molecules around it, and therefore ionised the molecule.
candle flame in an electric field If the candle is placed in between 2 plates connected to a Extra High Tension (E.H.T.) power supply, the positive ions will be attracted to the negative plate while the negative ions will be attracted to the positive plate.
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