Lecture5_SP08

# Lecture5_SP08 - the test charge The field is generated by...

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Topics to be covered in class: Electric fields and conductors Electrostatic energy and electrostatic potential How do we calculate electrostatic potential from the electrostatic field? Example: electrostatic potential due to several point charges Example: electrostatic potential due to continuous charge distribution Independent reading: Potential in conductors (Ch.25.3)

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Outer surface, that is! No electric field inside a conductor Æ no charges inside the conductor If an excess charge is placed on an isolated conductor, that amount of charge will move to the surface of the conductor!
Electric field outside of conductor is always normal (perpendicular) to the conductor’s surface

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Fields inside conductors with cavities +q
Fields inside conductors with cavities +q

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Why introduce electric potential?
Work done by the electric field on a charge: from A to B

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Electric field does the work Æ potential energy changes Note: the field is generated by all charges in the world except

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Unformatted text preview: the test charge! The field is generated by all charges in the world except the test charge! Electrostatic potential: potential energy per unit test charge! New energy unit: electron-Volt Where is the zero of the electrostatic potential? Concept Question: If 500 J of work are required to carry a 40-C charge from one point to another along a specific path, the potential difference between these two points is: A) 12.5 V B) 20,000 V C) 0.08 V D) depends on the path E) none of these Potential of a point charge Potential is an additive scalar Æ potential of several point charges Three possible configurations for an electron e and a proton p are shown below. Take the zero of potential to be at infinity and rank the three configurations according to the potential at S, from most negative to most positive. 1) 1, 2, 3 2) 3, 2, 1 3) 2, 3, 1 4) 1 and 2 tie, then 3 5) 1 and 3 tie, then 2...
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Lecture5_SP08 - the test charge The field is generated by...

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