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Charge, Electric Field and Potential

Charge, Electric Field and Potential. Eung Je Woo Department of Biomedical Engineering Kyung Hee University ejwoo@khu.ac.kr. Fundamental Quantity. Length (dimension or size) in meter (m) Time (sequence or duration or interval) in second (s) Mass in kilogram (kg) Charge in coulomb (C)

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Charge, Electric Field and Potential

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  1. Charge, Electric Field and Potential Eung Je Woo Department of Biomedical Engineering Kyung Hee University ejwoo@khu.ac.kr

  2. Fundamental Quantity • Length (dimension or size) in meter (m) • Time (sequence or duration or interval) in second (s) • Mass in kilogram (kg) • Charge in coulomb (C) • Temperature in kelvin (K) • Amount of substance in mole (mol) • Luminous intensity in candela (cd) • Mechanics • Electromagnetics • Optics • Thermodynamics • Chemistry

  3. Charged Particle and Charge Density • Free electron and hole are mobile • Unbounded ion and molecule are mobile • Bounded atom and molecule are immobile but vibrate • Polar molecule with no net charge may have dipole moment and rotate • Mass • Charge • Size • Position

  4. Field • Space with nothing • Space with a single charged particle • Space with two charged particles • Space with multiple charged particles • Space with a charge density distribution Qr z r y x Q 0

  5. Potential or Voltage • Space with electric field E(r) • Put a point charge at r1 from the infinity (a reference point) • Move the point charge from r1 to r2 E(r) Qr Qr r1 r2

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