6.2) F = k*q1*q2/r^2
6.17 = (9*10^9)(5.5*10^-6)^2/r^2
r = 0.21m and not 0.32m
I think that 0.32m is wrong, or am I doing something wrong?
Forgot to add one more question:
6.3) Point S is 0,15 m to the right of the centre of sphere A.
Calculate the magnitude and direction of the resultant field at point S.
EAs = 2.2*10^6 N.c^-1 right
EBs = 1.38*10^7 N.c^-1 left
Enet = 1.6*10^7 N.c^-1 right.............Correct?