Question #68dbe
1 Answer
Feb 26, 2018
Force of attraction
#F = (mu\ q_(m_1)\ q_( m_2)) /(4 π r ^2)#
where#mu# is the permeability of the intervening medium and#r# is their separation.
Taking
#10^-2= (4pi × 10^-7xx300xx40) /(4 π r ^2)#
#r= sqrt(( 10^-7xx300xx40) /( 10^-2))#
#r= 0.35\ m#