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May 25, 2020

Electric Force

The force applied by charged-particles to charged-particles.

The electric force is the force applied by a particle of charge q to other particles with a charge. The following formula gives the value of the electric force that a particle of charge q_1 applies on another particle of charge q_2 separated by distance r:

F = k q_1 * q_2 / (r * r)

where k is the Coulomb's constant.

Moving electrons, generating a current

How do we actually force electrons to move inside a metal? Using the above formula, one way to do this would be to have, at one end of a piece of metal, a large fixed charge q_1 (i.e. a battery). The other way to make them move is by using a current generator (see next posts).