Like gravitational force, electromagnetic force is also calculated using an “inverse square” law. For a surface charge distribution (a good approximation for charge on a plate in a parallel plate capacitor) where σ(r′) gives the charge per unit area at position r′, and dA′ is an infinitesimal element of area. It is, however, more precise to measure the magnetic force between two wires carrying equal currents, and therefore the fundamental SI electrical unit is the unit of current, from which the unit of charge is derived.
Coulomb’s force is a mutual force, it means that if charge ‘q1‘ exerts a force on charge ‘q2‘ then q2 also exerts an equal and opposite force on q1.
t This page was last edited on 25 September 2020, at 16:04. The force is along the straight line joining them.
be point charges, or a charged metal sphere).
g
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= q }, However, he did not generalize or elaborate on this. is the distance between the charges, the vector This is due to an internal balance within each individual atom.
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Coulomb's constant is given by
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