1. Two point charges Q₁ = +4.10 nC and Q₂ = 1.40 nC are separated by 45.0 cm.

(a) What is the electric potential at a point midway between the charges?

(b) What is the potential energy of the pair of charges?

2. Two capacitors give an equivalent capacitance of 9.60 pF when connected in parallel and an equivalent capacitance of 1.83 pF when connected in series. What is the capacitance of each capacitor?

(a) Smaller capacitor

(b) Bigger capacitor

3. Find the equivalent capacitance of the group of capacitors shown in the figure below. (Let C₁ = 4.60 F, C₂ = 3.90 F, C₃ = 2.80 F, C₄ = 1.50 F, C₅ = 3.40 F, C₆ = 6.60 F, C₇ = 6.10 F.)