Week 4 Homework Assignment

1. Calculate the current through each resistor in Fig.1 if each resistance R = 2.20kW. What is the potential difference between points A and B?

   Fig. 1	Fig. 2	Fig. 3

2. A battery with an emf of 12.0V shows a terminal voltage of 11.8V when operating in a circuit with two lightbulbs rated at 3.0W ( at 12.0V) which are connected in parallel with it. What is the battery's internal resistance?
3. In Fig. 2, let V = 90V and C₁ =  C₂ = C₃ = 8.8mF. How much energy is stored in the capacitor network?
4. An air-filled parallel-plate capacitor of capacitance C₀ is filled with two identically sized dielectric slabs of dielectric constants K₁ and K₂ as shown in Fig. 3. What is the new capacitance?