I have read that if we have an isolated positively charged conductor, we can increase its self capacitance by bringing an identical conductor close to it and then earthing it, so, that the second conductor develops a negative charge and thereby helps in reducing the net electric potential on the surface of the first conductor. (and so capacitance of conductor will increase as V will decrease). BUT my question is a)what happens to the self capacitance of the second conductor (does it become infinite? if so then why does the capacitance of the capacitor as a whole does not equal infinity!) b)if the first conductor is negatively charged and another identical conductor is brought close to it, won't the self-capacitance of the first conductor decrease.