1. A parallel-plate capacitor is formed from two 2.9 cm -diameter electrodes spaced 3.0 mm apart. The electric field strength inside the capacitor is 1.0×106N/C.
What is the charge (in nC) on each electrode?
Express your answer using two significant figures.2-Capacitors C1=10μF and C2=20μF are each charged to 22 V , then disconnected from the battery without changing the charge on the capacitor plates. The two capacitors are then connected in parallel, with the positive plate of C1 connected to the negative plate of C2 and vice versa.
a. Afterward, what is the charge on each capacitor? Q1, Q2
b. What is the potential difference across each capacitor? delta V1 ,V2
3. What is the resistance of:
a. A 1.90 m long copper wire that is 0.500 mm in diameter?
b. A 30.0 cm long piece of carbon with a 1.70 mm ×1.70 mm square cross section?
4. An electric device delivers a current of 4 A to a device. How many electrons flow through this device in 6 s? (e = 1.60 × 10-19 C)
5. A battery with EMF 90.0 V has internal resistance Rb = 9.84 Ω .
a. What is the reading Vv of a voltmeter having total resistance Rv = 450 Ω when it is placed across the terminals of the battery?
b. What is the maximum value that the ratio Rb/Rv may have if the percent error in the reading of the EMF of a battery is not to exceed 3.50 % ? ((Rb/Rv)max =)