Flashcards
Electric Fields Quiz
Cards in this deck (15)
- 1Any object with a charge has an electric field True or False?True
- 2Electric charge Q is measured in ?Coulombs C
Can be positive or Negative - 3Opposite charged particles ?attract
- 4Like charges ...repel
- 5If a charged particle is placed in an electric field it will ?experience a force
- 6Coulomb's LawF = kQ1Q2 /r^2
Where:
k = 1/ 4pi epsilon - 7In Coulomb's Law what is FF = the force of attraction or repulsion between two point charges
- 8Coulomb's Law : 3 facts1. the force on Q1 is always equal & opposite to the force on Q2 (N3)
2. Inverse Square Law (further apart = weaker)
3. Size of the force depends on the permittivity of ther material between the 2 charges
( spece = 8.85x10-12) - 9Radial Electric FieldsFor point charges e.g. proton
For a positive charge arrows point outwards
For a negative charge arrows point inwards
Equally spaced, straight, non-touching lines (diagram) - 10Uniform Electric FieldLines between 2 parallel plates
From + to -
Can be produced by connecting 2 parallel plates to opposite poles of a battery - 11Electric Field strength = ?Force per unit charge
E = F/Q - 12Electric Field Strength Facts1. E is a vector pointing in the direction that a positive charge would move
2. E = NC-1
3. In a radial field the field strength depends how far you are from the charge
4. In a uniform field the field strength is the same everywhere - 13In a radial field E is inversely proportional tor^2
- 14Equation for calculating the field strength at distance r from a point charge QDerivation:
F = kQq/r^2 & E=F/q
Sub. 1 into 2
= E = kQq/qr^2
Cancel the q to give
E = kQ/r^2 - 15The field strength in a uniform field =E = V/d
E depends on the p.d. and the distance between the 2 plates
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- a level Physics (Unit 4 - Section 2: Electric & Magnetic Fields) Flashcards on Electric Fields Quiz , created by 2008schulz on 31/05/2015.
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