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# Lecture 4

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: .

## Lecture 4

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### Presentation Transcript

1. Lecture 4 1. Review superposition principle and dipole field pattern Field Pattern of Charge: Method of Parallelogram:

2. Clicker 4-1

3. Clicker 401: Dipole field pattern and dipole interaction

4. Field at a point P

5. Digression on small epsilon expansion General Formula: Where a is negative: Product: So the general formula above works for both positive and negative!

6. Digression on small epsilon expansion continued... Examples: At P (from slide 2): Dipole:

7. More on dipoles... Dipole in Uniform E:

8. Uniform dipole in uniform E-field continued... Direction: CW

9. 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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