# Lec-3 - Previous Lectures Field of a point charge 1 Q ^ E=...

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Previous Lectures Field of a point charge: E = 1 4 π 0 Q r 2 ˆ r Field of a line of charge: E = 1 2 π 0 λ r ˆ r Field of a plane of charge: E = σ 2 0 (points away from plane) – p.

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Previous Lectures Field of a point charge: E = 1 4 π 0 Q r 2 ˆ r Field of a line of charge: E = 1 2 π 0 λ r ˆ r Field of a plane of charge: E = σ 2 0 (points away from plane) – p.
Electrostatics If we know where the charges are, we can work out the fields. – p.

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Electrostatics If we know where the charges are, we can work out the fields. d E (at r ) = 1 4 π 0 dQ ( r r ) | r r | 3 This formula ALWAYS works, but the math might be a little messy. – p.
Today Gauss’ Law – provides an easy way to get the field in certain special cases. – p.

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Count the bullets – p.
Count the bullets – p.

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Count the bullets – p.
Count the bullets – p.

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Count the bullets – p. 1
Count the bullets – p. 1

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Count the bullets – p. 1
The Main Point If a closed surface surrounds the source, the same number of bullets pass through the surface every second.

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