A solid conducting sphere of radius 5.00 cm carries a net charge. To find the value of the charge, you measure the potential difference VAB=VA−VB between point A, which is 8.00 cm from the center of the sphere, and point B, which is a distance r from the center of the sphere. You repeat these measurements for several values of r > 8cm. When you plot your data as VAB versus 1/r, the values lie close to a straight line with slope -18.0 V⋅m. What does your data give for the net charge on the sphere?