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## Homework Statement

A) Three conducting spheres, a, B , and c, form

an equilateral triangle of side length "l" and have

initial charges of -2q, -4q, and 8q, respectively.

Show that the magnitude of the electrostatic force

between spheres a and c is given by

F_ac= (4q^2)/(π€_o l^2 )

B) The following steps are then taken: a and b are

connected by a thin wire and then disconnected;

b is grounded by the wire and the wire is then

removed; b and c are connected by the wire and

then disconnected. Show that the magnitudes of

the electrostatic forces between spheres a and c

and between spheres b and c, respectively, are

given by

F_ac=(3q^2)/(π€_o l^2 )

F_bc=(4q^2)/(π€_o l^2 )

## Homework Equations

I think I got part A right, but part B i seem to be stuck unfortunately.

Any help would be appreciated, thanks.

## The Attempt at a Solution

A)

F_ac=(-2q)(8q)/(4π€_o l^2)

F_ac=(4q^2)/(π€_o l^2)