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Unformatted text preview: E , at the location of a test particle with a small charge q to be q F E q ← ≡ . The test charge q is defined such that it doesn’t disturb the original charge distribution associated with the electric field. The SI units for electric fields are N/C. The electric field of any charge distribution is a vector field. Consider a single particle with charge q (below). Since the magnitude of the force on a test charge > q due to q is 2 4 1 r q q F q ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ = ← πε . The magnitude of the electric field, due to q , at the location of the test charge q , which is some distance r from q , is 2 4 1 r q E ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ = . Note that this does not depend on q . Like electrostatic force, the electric field obeys the principle of superposition. For a distribution of n charges n E E E E + + + = L 2 1 total , where i E is the electric field due to the i th charge....
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