Consider two charge particles. One is test particle another one is source particle.
Test particle: $$Q_t$$
Source particle: $$Q_s$$
Now assuming both of the charges are static, we can write according to coulomb's law:
Test particle: $$Q_t$$
Source particle: $$Q_s$$
Now assuming both of the charges are static, we can write according to coulomb's law:
$$F = \dfrac{k . Q_t . Q_s}{{r_{st}}^2}$$
Where ' k ' is the proportionality constant. In SI units value of ' k ' is
$$8.9875517873681764 * 10^{-9} N . M^2 . C^{-2}$$
It is represented in SI units as
$$k = \dfrac{1}{4\pi{\epsilon_0}}$$
Where,
$${\epsilon_0}$$
is the permittivity of free space.
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