Q1- Three charges q₁= +10*10^-6 C, q₂ = -5*10^-6 C and q₃ = +20*10^-6 C are placed in a straight line as bellow.

•        2cm                •                3cm                  •                                                             

q₁                                    q₂                                                      q₃

a) Find the magnitude and direction of the force on q₂      

b) Find the magnitude and direction of the field at position of q₂ due to q₁ and q₂.

Q2- Two dipoles with charge 1*10^-12 C each and length 3 cm are placed on a straight line in such a way that their negative charges facing each other. The distance between the negative charges is 6 cm. Find the net force(magnitude and direction) exerted by one dipole on the other.

Solution