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Lecture 4. 1. Review superposition principle and dipole field pattern. Field Pattern of Charge:. Method of Parallelogram:. Clicker 4-1. Clicker 401: Dipole field pattern and dipole interaction. Field at a point P. Digression on small epsilon expansion. General Formula: .

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## Lecture 4

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**Lecture 4**1. Review superposition principle and dipole field pattern Field Pattern of Charge: Method of Parallelogram:**Digression on small epsilon expansion**General Formula: Where a is negative: Product: So the general formula above works for both positive and negative!**Digression on small epsilon expansion continued...**Examples: At P (from slide 2): Dipole:**More on dipoles...**Dipole in Uniform E:**Uniform dipole in uniform E-field continued...**Direction: CW**Is electric field real?**Source creates field: field spreads out with the speed of light. Time taken to spread out 1 foot: Dipole field At t=0, reaction occurs dipole system dissolves At P: Electric field due to the dipole continues to be present for t=0 t1 = r/c

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