I just started my topic on capacitance today. In the above derivation of capacitance of an isolated conducting sphere,+q charge is distributed uniformly. After substituting the value of potential, we get capacitance of the sphere.
Here is my question. If a -q charge is distributed uniformly the potential will be negative (V=-Kq/r). Now if I substitute this in the formula for capacitance I get a negative value but when I looked it up online it said that there is no negative value of capacitance. Where am I going wrong? What would be the capacitance of a negatively charged isolated conducting sphere?