Q43:The circuit in Figure P28.43 has been connected for a long time.
(a) What is the potential difference across the capacitor?
(b) If the battery is disconnected from the circuit, over what time interval does the capacitor discharge to one-tenth its initial voltage?
r1 =Ω r2 =Ω r3 =Ω r4 =Ω
v =V, c =