Question
Which of the following would decrease the capacity of a para A Replacing the dielectric material between the plates with e capacity of a parallel-plate capacitor? 7 Which of the following would decrease the capacit the plates with one that has a larger dielectric ing the dielectric material between the plates with one that has a larger d constant. B. Moving the plates closer together C. Increasing the voltage between the plates D. Using smaller plates E. More than one of the above answers ed in parallel. C. 14 nF E. 28 nF itor B. 6.9 nF 8. A 12 nF and a 16 nF capaci are connected in parallel. What is the capacitance of the combination? D. 8.0 nF A. 0.15 nF 9, If it takes one joule of work to move one coulomb of charge from point one coulomb of charge from point A to point B, which of the following is true about the two points? A. The electric field strength is one joule per electron. B. The resistance between them is one ohnm. C. The current is one coulomb per ampere. D. The electric field strength is one newton per coulomb. E. The potential difference is one volt. 10. A 5 60 W toaster oven is connected to a 110 V outlet. What is the resistance of the toaster oven A. 2.9 Use the following information for the next 2 (two) questions A scientist designs a circuit of resistors for a project. Her circuit is shown in t C. 622 E. 0.20 She connects the circuit to a 15 V power supply he ci rcuit diagram to the right. 652 12 8 9 5 11. What is the combined resistance of the circuit? A. 8.6 B. 13.6 C. 24.8 12. D. D. 40 How does the voltage across the 8 ohm resistor compare to the voltage across the A. The voltage across the 8 ohm resistor is the same as the voltage across the 9 ohm. B. The voltage across the 8 ohm resistor is less than the voltage across the 9 ohm. C. The voltage across the 8 ohm resistor is larger than as the voltage across the 9 ol 9 ohm resisto r? Itage across the 8 ohm resistor is larger than as the voltage across the 9 ohm. D. There is not enough information to tell. 13. A 4- -ohm and a 12-ohm resistor are connected in parallel. When this parallel c circuit, a current of 1 A is observed in the 4-ohm resistor. What is the A. 0.33 A istor are connected in parallel. When this parallel combination is placed 3 B. current in the 12-ohm resistor? C. 3 A D. 1 A
Explanation / Answer
7) Answer is D
C= Ae/d
Area will be smaller for smaller plates
8) Answer is E
for parallel combination
Ceq = C1+C2 = 28 NF
9) Answer is A
W = Q*E = 1
=> E = 1
10) Answer is D
R = V^2/W = 22 ohm
11) Answer is A
12) Answer is C
Since equivalent resistance for 8 ohm arm is less than 9 ohm arm
13) Answer is A
Potential difference is same across each resistor = 4*1= 4 V
Hence current across 12 ohm resistor = 4/12= 0.33 A
