Answer :

We know that,

Electrostatic force,


Єo is the permittivity of vacuum

q1, q2 is the magnitude of the charges on the charge particles

r is the distance between the two charge particles.

Taking the dimensions,

Note that Charge = Current × Time. Hence, its dimensional formula is

Note that 4π is a dimensionless constant. Note that . Hence, . Also, r is just distance or length. Thus,

Rearranging, we get

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