Electric Fields

Unit 4 Physics Edexcel

2.1 Electrical and Magnetic Fields

  • Created by: Craig
  • Created on: 06-10-10 10:55

Coulombs Law

  • Any object carrying a charge will experience a force when in the presence of another body also carrying a charge
  • This force is given by Coulomb's Law
  • The formula is:

\mathbf{F}_{21}= {1 \over 4\pi\varepsilon_0}{q_1 q_2 \over r^2}\mathbf{\hat{r}}_{21} \  (http://upload.wikimedia.org/math/e/0/b/e0bddf342b5f851476af3622933a5105.png)

The value of the constant is 8.99 x 10^9

Coulomb's law follows the inverse square law

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Difference betwwen electrical field strength and e

  • Electric Field Strength is defined as the force per unit charge experienced by a test charge at that point
  • The Electric Potential at a point in an electric field is defined as the work done in bringing a test unit positive charge from infinity to that point.
  • The potential charge at infinity is always defined to be zero.
  • Electric Field Strength is a vector quanitity and Electric Potential is a scalar quantity.
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  • In an electric field, you have areas were the electrical potential are the same
  • These areas can be connected by lines called equipotentials


  • The closer these lines are, the stronger the field. The further the lines the weaker the field.
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Difference Between Radical and Uniform feilds


  • Uniform Fields have the same electical field strength.
  • Radical Fields have different electical field strenths.
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