1) Two identical capacitors are connected
(a) in series with a resistor and a battery and
(b) in parallel first and then in series with the same resistor and battery. Find the ratio of the time constants to charge up the capacitors between circuits (a) and (b).
2) Two capacitors (C1=1.00 ?F and C2=2.00 ?F) are charged with Q1=3.00 ?C on the positive plate of capacitor 1 and Q2=3.00 ?C on the positive plate of capacitor 2. Now if the positive plates are connected with each other and negative plates are connected with each other, what is
(a) the final potential difference across each capacitor and
(b) the total charge on the positive plate of capacitor 1?
3) A copper cable hung on two power poles that are 121 m apart carries a current of 211 A. If the potential difference between the two ends of the cable is 0.400 V, what is the weight of the cable? The resistivity and density of copper are 1.72× 10?8 ?m and 8.92× 103 kg/m3, respectively.