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Answer 1 · 2015-11-10T18:21:02

#202.5"N"#

Coulomb's Law gives us the force #F# between two changes #q_2# and #q_2# separated by a distance #r#:

#F=1/(4piepsilon_0).(q_1xxq_2)/(r^2)#

This simplifies to:

#F=k.(q_1xxq_2)/(r^2)#

Where #k=9xx10^(9)"m/F"#

This distance between the two spheres is taken as the distance between their two centres. So #r=2xx0.2=0.4"m"#

#:.F=(9xx10^(9)xx(60xx10^(-6))^(2))/(0.4^2)#

#:.F=202.5"N"#