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Field - Coggle Diagram

- - - - F=Eq
        
        E= constant for uniform field
        or E=Qk/rr for field created by point source
    - - F= mg
        
        g=9.8N/kg for uniform field (earth surface）
        or g=Gm/rr for radial field (treat earth as a particle)
    - - F=Bvq sin(v,B) Vector quantity Force is the cross product of vector quantity velocity and magnetic strength
  - - - In electric field, field line is always pointing towards the direction of force on positive test charge
      - In gravitational field, field line is always pointing towards the direction of force on test mass