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1Lecture-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 Fieldof a distribution of charges122112212212119221ˆˆˆ;4(4)8.9910ooQ QrFrrrrrwherekNCMπεπε−−==≡≡=×rr2211QFErr≡Lines of Force: How calculate? Numerical Calculation 12Fr21ˆˆrr≡21Fr