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Lecture9_SP08

# Lecture9_SP08 - Direction of current the nature of charge...

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Topics to be covered in class: Review: dielectric inside a capacitor Resistivity, conductivity, resistance Ohms’s Law Review: upcoming mid-term Independent reading: (a) temperature dependence of the resistance (pp.870-871)

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Dielectric inserted in a capacitor changes its capacitance!
Dielectric inserted in a capacitor changes its capacitance!

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Dielectric is pulled into a capacitor by fringe fields!

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Battery forces currents to move through a conductor

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Current is the flow of charges. And charges don’t build up!* *unless we have a capacitor Æ later
Direction of current: the nature of charge carriers does not matter!

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Current Density

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Unformatted text preview: Direction of current: the nature of charge carriers does not matter! A certain wire has resistance R. Another wire, of the same material, has half the length and half the diameter of the first wire. The resistance of the second wire is: A) R/4 B) R/2 C) R D) 2R E) 4R Two wires are made of the same material and have the same length but different radii. They are joined end-to-end and a potential difference is maintained across the combination. Of the following the quantity that is the same for both wires is: A) potential difference B) current C) current density D) electric field E) none of the above...
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Lecture9_SP08 - Direction of current the nature of charge...

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