Question

Coulomb's law,S.I.unit of charge;permittivity of free space

Answer 1

The coulomb (symbol: C) is the International System of Units (SI) unit of electric charge. It is the charge (symbol: Q or q) transported by a constant current of one ampere in one second:

CoulombUnit systemSI derived unitUnit ofElectric chargeSymbolC Named afterCharles-Augustin de CoulombUnit conversions1 C in ...... is equal to ...  
● SI base units   A⋅s   CGS units   2997924580 
●statC   Atomic units   6.24150934(14)e×1018[1]

Thus, it is also the amount of excess charge on a capacitor of one farad charged to a potential

It is equivalent to the charge of approximately 6.242×1018 (1.036×10−5 mol) protons, and −1 C is equivalent to the charge of approximately 6.242×1018 electrons.

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