ElectricElectric Force Draft for Information Only
ContentConservation of Charge
Conservation of ChargeThe net charge of a system and its surroundings cannot change. But charge can move from the systtem to surroundings or from surroundings to the system. However, charges can be created or destroyed in (+,−) pairs. For examples, electron-positron annihilation.Charges of an Atom![]() Polarization of Atoms![]() ![]()
In an induced dipole, the distance between the charges is proportional to the strength of the applied field.
Force of a Point Charge on an Atom![]()
Then the electric field 𝐸0 polarizes atom ![]()
The induced dipole in turn creates field 𝐸𝑎 at point ![]()
The electric field 𝐸𝑎 due to the induced dipole exerts force on point charge ![]()
By reciprocity, the force 𝐹𝑎 that the point charge exerts on atom will be equal and opposite to the force 𝐹0 ![]()
Neutral atoms are attracted by charges with interaction strength ~1/𝑟5
Source and Referencehttps://www.youtube.com/watch?v=rb_ybczb7Ig&list=PLZ6kagz8q0bvxaUKCe2RRvU_h7wtNNxxi&index=3 ©sideway ID: 191101002 Last Updated: 11/10/2019 Revision: 0 Latest Updated Links
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