A capacitor of capacitance is charged to a potential difference from a cell and then disconnected from it. A charge is now given to its positive plate. The potential difference across the capacitor is now _________.
Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of 10 and the second has a voltage gain of 20. If the input signal is 0.01 volt, calculate the output ac signal.