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# Lec-2 - Previous Lecture Coulombs Law(vector form 1 q1 q2(r...

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Previous Lecture Coulomb’s Law (vector form) F 2 on 1 = 1 4 π 0 q 1 q 2 ( r 1 r 2 ) | r 1 r 2 | 3 Field of a point charge q at origin E = 1 4 π 0 q r 3 r Principle of Superposition September 1, 2011 – p.

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Announcement Beginning next Tuesday, you should pick a seat and sit in it every time. We will take attendance by checking which seats are occupied. – p.
Today Continuous charge distributions. Charge density Integrating to get the electric field Field lines – p.

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Tricks of the Trade – p.
Tricks of the Trade Make approximations – p.

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Tricks of the Trade Make approximations Use symmetry – p.
Tricks of the Trade Make approximations Use symmetry Solve problems algebraically – p.

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From the Equation Sheet F 2 on 1 = 1 4 π 0 q 1 q 2 ( r 1 r 2 ) | r 1 r 2 | 3 F = q E d E (at r ) = 1 4 π 0 dQ ( r r ) | r r | 3 – p.

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Limiting Case I Close to a long wire: x a x 2 + a 2 a + a - a x E = 1 2 π 0 λ x a x 2 + a 2 ˆ i 1 2 π 0 λ x a a ˆ i E 1 2 π 0 λ x ˆ i
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