Lecture-2-01-17-08 - Lecture-2 Charges can be accumulated...

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1 Lecture-2 Charges can be accumulated, for example, by:
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2 Conductors: Charges are free to move and exist at surfaces. Insulators: Charges are immobile, and remain fixed wherever initially placed. Coulomb’s Law Electric Field of a distribution of charges 1 2 21 12 21 2 21 21 1 9 2 2 1 ˆ ˆ ˆ ; 4 (4 ) 8.99 10 o o Q Q r F r r r r r where k NC M πε πε = = = × r r 2 21 1 Q F E r r Lines of Force: How calculate? Numerical Calculation 12 F r 21 ˆ ˆ r r 21 F r
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