Area of plates of a flat capacitor S, distance between them d.
a. How will the capacitance of a capacitor change if a metal plate of thickness d/3 and area S is placed between its plates?
b. How will the capacitance of a capacitor change if a metal plate of the same thickness d/3 but area S′ < S is placed between its plates?
c. Will the capacitance of the capacitor change if this plate touches one of the plates?