How many electrons must be removed from a neutral object to leave a net charge of 0.500 μc?

Net charge of the object = 0.500 ÎĽc

The charge of electron = - 1.602 x 10^-19 C

Calculating the net change in the number of electrons = 0.5 x 10^-6 / - 1.602 x 10^-19 = - 3.12 x 10^12

The negative sign implies the number of electrons that needs to be removed that is 3.12 x 10^12