Hi
Could someone please help me with part b of this problem?
Calculate
a) the force between 2 charges of +1.4nC and +1.6nC on point conductors 40cm apart in air.
b)What size of charge on a third point conductor placed midway between the first two conductors would result in doubling of the magnitude of the force on the 1.4nC charge?
My answer for the first part was 1.2586x10^-7
Thanks in advance!!!