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Electric field and Potential. Tutoring schedule. Recall the Electric Field?. Recall the Electric Field?. Field lines?. Useful conceptualization of the electric field. Field Lines:. Field Lines:. A field line always Begins on a positive charge (or infinity)

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## Electric field and Potential

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**Electric field and Potential**Tutoring schedule**Field lines?**Useful conceptualization of the electric field.**A field line always**• Begins on a positive charge (or infinity) • Ends on a negative charge (or infinity)**Field Lines:**Big step!**Field Lines:**Big step!**Field Lines:**Big steps give rough idea of field lines**Field Lines:**Lot’s of little steps more accurate**A any point along a field line, the electric field points in**the direction tangent to the line. But the field line by itself tells us nothing about the magnitude of E**Note: color**Scheme is backward**Note: Electric field lines are not the path a test particle**would follow Hockey demo again !! http://phet.colorado.edu/en/simulation/electric-hockey All they do is indicate the direction of the electric field (at any given point). But, you can get a little more info too …**Magnitude of electric field**Is related to the spacing of adjacent lines The closer the spacing, the stronger the field**Electric Fields and conductors:**Conductor ↔ charges free to move**Electric Fields and conductors:**Conductor ↔ charges free to move + + + − + − + − + − − −**How it works:**Eventually …..**How it works:**The mobile charges rearrange themselves until everywhere in the conductor**So in the static case :**• Electric field is zero inside a conductor • No Net charge on the inside of a conductor • free charge must all be on surface • Electric field just outside the conductor must be perpendicular to the surface! • Magnitude of this Electric field is related to the density of charge on the surface at that point. (Gauss’s Law again)

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