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Ch 21, L3-AG, S'11

Ch 21, L3-AG, S'11 - CHAPTER 21 Electric Field Electric...

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CHAPTER 21 Electric Field
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Electric Field Concept Test charge: a positive unit charge It is assumed that the test charge: • does not change the electric feld under consideration • does not generate its own feld A charged object changes the properties oF space around it by generating an electric feld. To fnd out iF there is an electric feld at a certain point, place a test charge in this point and see iF there is an electrostatic Force acting on it.
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Electric Field Concept On the other hand, if we know an electric Feld at a certain point, then E q F ! ! 0 = If q 0 >0 , E F ! ! !! If q 0 <0 , E F ! ! !" C N q F E / ] / [ ] [ = = Electric feld is defned as a Force per unit charge
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Electric Field of a Point Charge r r q E ˆ 4 1 2 0 !" = ! Vector equation for the electric Feld
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Electric Field of a Point Charge 2 0 0 4 1 r qq F !" = 2 0 0 4 1 r q q F E = = q + E P Calculate electric feld oF charge q in point P 1. Place a test charge q 0 in point P 2. Compute the electrostatic Force acting From charge q on the test charge 3. Calculate electric feld oF charge q by dividing Force by the test charge magnitude The magnitude, or strength, oF an electric feld in any point oF space surrounding a source charge is related directly to the charge magnitude and inversely to the square distance From the source charge.
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Ch 21, L3-AG, S'11 - CHAPTER 21 Electric Field Electric...

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