Capacitors - General Questions (2)

A capacitor and an output resistor form a series circuit with a square wave applied. The circuit is:

A capacitor has 25 V across its plates and a stored charge of 1500 C. What is the capacitance value?

For a given charge difference, electrostatic field strength varies according to:

How is ac current related to ac voltage in a purely capacitive circuit?

The strength of an electric field at a given point is proportional to the potential difference on the plates and inversely proportional to the:

What is the value of a capacitor that can store two coulombs of charge when 500 volts is applied across its plates?

What is the total current for a 5 MHz, 1 V_ac circuit that consists of a 27 pF capacitor and a 1 k resistor connected in parallel?