Lect_8_note

Lect_8_note - Electric Potential As a charged particle moves in an electric field it will experience a change in potential B U V = = E ds A qo

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Electric Potential ± As a charged particle moves in an electric field, it will experience a change in potential B A o U Vd q ∆= = Es

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Derive Electric Field from Potential ± Given V ( x , y , z ) you can find E x , E y and E z as partial derivatives xyz VVV EEE ∂∂ =− Animation ±
Potential x V x E

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Derive Electric Field from Potential
Derive Electric Field from Potential

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Derive Electric Field from Potential
Derive Electric Field from Potential

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Chapter 26-1 Capacitance
Capacitance ± Capacitance is a physical property which describes the ability of an object to store electric charge

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Definition of Capacitance ± The capacitance , C , is defined as the ratio of the magnitude of the charge on the conductor to the potential change of the conductor caused by the charging Q C V =
Capacitance – Isolated Conductor Sphere ± Assume a spherical charged conductor. 4 / o ee QQR C πε R Vk Q Rk == e Q r =

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Conductor Sphere 4 / o ee QQR C πε R Vk Q Rk == ± The SI unit of capacitance is the farad (F) ± C=1F, R= 9000000000 m ± Earth, C=0.0007 F ± R=30cm ball, C=30 pF
Capacitors – Condenser ± Capacitors are devices that store electric charge

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This note was uploaded on 01/28/2011 for the course PHYS 011 taught by Professor Nianlin during the Fall '08 term at HKUST.

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Lect_8_note - Electric Potential As a charged particle moves in an electric field it will experience a change in potential B U V = = E ds A qo

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