(ne02) Electric Charges and Forces


Models

  1. Particle (Energy + Mass Movement)
  2. Wave (Energy Transfer)
  3. Field (NEW)

From Forces to Fields:

$$ F_g(r) = K_g \, { \color{fuchsia}{m} M \over r^2} \, [N] $$ → Fg(r=6351km) = m g
(g is the strength of the gravitational field on earth's surface [N/kg] (r=6371km))
$$ F_e(r) = {1 \over {4 \pi \epsilon_o}} \, { \color{fuchsia} {q} Q \over r^2} \, [N] $$ if $$ E(r) = {1 \over {4 \pi \epsilon_o}} \, { Q \over r^2} \, [N/C] $$ → Fe(r) = q E(r)
$$ F_e = {1 \over {4 \pi \epsilon_o}} \, { \color{fuchsia} {q} Q \over r^2} \, [N] $$

PBL Highlights (30 min)

History Knight-v4 ch 22.1 → 22.3

Video: Professor Julius Sumner Miller on Electrostatic Phenomena

Coulombs Law (Knight ch2.4)

Concept of Electric Field (Knight ch2.4)


  /   教學   /   物理   baixiaoming AT gmail.com