I know coloumbs law but when 3 charges are involved i am a little unsure.
if I have 3 charges in a row
R (+q charge)
S (+2q charge)
T (+3q charge)
distance between R,S =d1
distance between S,T =d2 which looks 3 times distance as d1
q1)to work out 0 new electric force when d2 is = to...arent I just working out if d1 or d2=0? The answer is sqroot 3 *d1
q2) using a -2q charge and touching R,S,T what is the charge of T?
Isnt this just stay as +3Q? the answer is 15q/8