Lect_2_note

Lect_2_note - Chapter 23 -2 Electric Fields Coulombs Law in...

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Chapter 23 -2 Electric Fields
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mathematics : Vectors ± In vector form, ± is a unit vector directed from q 1 to q 2 ± The like charges produce a repulsive force between them 12 12 2 ˆ e qq k r = Fr ˆ r
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Electric Field ± The electric force is a field force ± Field forces can act through space ± The effect is produced even with no physical contact between objects
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Electric Field – Definition ± An electric field is said to exist in the region of space around a charged object ± This charged object is the source charge ± When another charged object, the test charge , enters this electric field, an electric force acts on it.
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Electric Field ± The electric field vector, E , at a point in space is defined as the electric force F acting on a positive test charge, q o placed at that point divided by the test charge: E = F e / q o
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Electric Field of a Point Charge ± Remember Coulomb’s law, between the source and test charges, can be expressed as ± Then, the electric field will be 2 ˆ o ee qq k r = Fr 2 ˆ e e o q k qr == F Er ± Movie 2_3
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This note was uploaded on 01/28/2011 for the course PHYS 011 taught by Professor Nianlin during the Fall '08 term at HKUST.

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Lect_2_note - Chapter 23 -2 Electric Fields Coulombs Law in...

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