Question

two charges 5 micro C and 10 micro coulomb are seperaed by a distance of 10cm in a medium of relative permittivity 8. the force between them is​

Answer 1

F=8*5*10^-6*10*10^-6/10*10^-2*10*10^-2

=400*10^-12/100*10^-4

=4*10^-8N

hope this helps u.