CBSE - XII Science - Physics - Electric Charges and Fields
what is coulomb law without air medium
force of attraction or repulsion between two point charges, q1 and q2 at rest placed in "free space" separated by a distance r, is directly proportional to product of the charges and is inversely proportional to the square of distance between them i.e.
Here is a constant, its value is 9 x 109 N-m2/C2
eo is called permittivity of free space and is equal to 8.85 x 10-12 C2/N-m2.
Hope this helps.
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