(ne05) 電位 Electric Potential


Potential of Dipole http://www.ch.ic.ac.uk/local/physical/mi_2.html

preamble

  1. Finish Previous Lecture...
  2. MS#6 is next class

Key Points

AreaForcePotential Energy
Gravity $$ \mathbf F_j = { m_j } \color{fuchsia} { G \sum { m_i \over r_{ij}^2 } } {\hat r_{ij} } $$ $$ U_j = { m_j } G \sum { m_i \over r_{ij} } $$
Gravity
on Earth
$$ \mathbf F_j = { m_j } \color{fuchsia} { g }\, {\hat r_{j} }$$ $$ \Delta U_j = { m_j } \color{fuchsia} { g } \, r_{j} $$

Electric $$ \mathbf F_j = { q_j} \color{fuchsia} { K \sum { q_i \over r_{ij}^2 } } {\hat r_{ij} } $$ $$ U_j = {q_j} K \sum { q_i \over r_{ij} } $$
$$ \mathbf F_j = { q_j} \, \mathbf E(r_j) $$ $$ U_j = { q_j} \, V(r_j) $$

Lecture Power Points: Knight Chapter 28

Blackboard Eg: From Potential → Field of an ∞ long charged rod


Charges and Fields
Potential and Fields

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