Is there any lower limit to the electric force between two particles placed at a separation of 1 cm?
Yes, there is a lower limit to the electric force between two particles.
We know that electric force is given as:
This is Coulomb’s Law. Here, k is a constant .
k = 
= 9× 109 Nm2C-2, q1 and q2 are the charges of two particles and r is the distance between two charges.
The smallest possible charge would be that of an electron.
r=1 cm = 0.01 m
Thus,
Hence, lower limit to the electric force between two particles placed at a separation of 1 cm would be 2.3× 10-24 N.
2