lecture02 - Scalar field: Temperatures The shown...

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Unformatted text preview: Scalar field: Temperatures The shown temperatures are samples of the field 77 82 83 68 55 66 83 75 80 90 91 75 71 80 72 84 73 82 88 92 77 88 88 73 64 Vector field: Winds 77 82 83 68 55 66 83 75 80 90 91 75 71 80 72 84 73 57 88 92 77 56 88 73 64 3. Electric field Coulombs low and electric field Q q - test charge E q r r Q qk r r Q q k F = = = 2 2 r E q F = q F E = Definition field electric- E Units [ ] C N q F E / = = (Action at a distance?) r r r If the electric force on a test charge q located at point P is F , then the electric field at point P is F/q. Because the force is always proportional to q , the electric field is independent of the test charge! P Charge Q creates an electric (electrostatic) field E. Charge q is used to find this electric field E. Example: A negative charge, placed in the electric field between two charged plates, experiences an electric force as shown below. What is the direction of the electric field? A. Left B. Right C. Upward D. Downward The negative charge is attracted by the positive plate and is repelled from the negative plate The electric field is directed from the positive to the negative charge!- q +- F E Example: Between the red and the blue charges, which of them experiences the greater electric field due to the green charge?...
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lecture02 - Scalar field: Temperatures The shown...

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