E= q 4 2 g is positive the direction of the field is away from the charge
+ r r q E ˆ 4 1 2 0 = q is positive: the direction of the field is away from the charge
E= q 4 2 g is negative the direction of the field is towards the charge
- r r q E ˆ 4 1 2 0 = q is negative: the direction of the field is towards the charge
Superposition Principle 电场强度叠加原理 F4=geNet t 92V 4(+E2+E 3 1 Location of ge 4 E E ne
Superposition Principle 电场强度叠加原理 - + q1 q2 ( ) 4 1 2 3 4 4 net q E E E F q E = + + = q + 3 Location of q4 E1 E2 Enet E3
Superposition Principle 电场强度叠加原理 In general: net s e +2+b2+ or het s The net field at a location in space is the vector sum of the fields contributed by all charged particles at other locations
Superposition Principle 电场强度叠加原理 Enet = E1 + E2 + E3 + In general: = i E Ei net or: The net field at a location in space is the vector sum of the fields contributed by all charged particles at other locations
Dipole 电偶极子 H C Hydrogen chloride Water
-q +q Dipole 电偶极子 d + - Hydrogen chloride + - Water O H H