Two positive charges; q₁ = 41 nC and q₂ =61 nC, are a distance d = 7 mm apart. q₁ is to the left of q₂, and the charges sit on the x-axis.

a) Find the magnitude of the force q₁ exerts on q₂.

b) Find the magnitude of the force q₂ exerts on q₁.

c) In which direction does the force of q₁ on q₂ act?

To the left

To the right

Neither of the two

d) Find the distance from q₁ that another charge q₃ = 6 nC must be placed so that the force on q₃ is zero.