How many Joules of energy are stored on a capacitor if it is ten to the negative eighth farads and it holds ten to the negative third coulombs? If you don't know the formula, 
How many Joules of energy are stored on a capacitor if it is ten to the negative eighth farads and it holds ten to the negative third coulombs? If you don't know the formula, you might be able to derive it using the facts that the differential of work is equal to the electrical potential difference times the differential of charge. In a capacitor, the electrical potential difference equals the charge divided by the capacitance.
How many Joules of energy are stored on a capacitor if it is ten to the negative eighth farads and it holds ten to the negative third coulombs?