" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
3240=9*10^9*4*10^-6*9*10^-6/r^2
3240r^2=81*4*10^-3
3240r^2/324=10^-3
r^2=10^-4
r=10^-2
r=1cm