Q1. A power supply passing through a resistor is supposed to deliver 22-v DC at a max current of 150mA. The transformer's peak output voltage is appropriate to charge a capacitor to a full 22V, and the primary is supplied with 60-Hz AC. What value of capacitance will ensure that an output voltage stays within 3% of the rated 22v?
Q2. The parallel metal plate of a capacitor is detached by a distance of 0.5cm and is connected to a 90v battery. Find the electric field between them and surface charge density on the plate.