# Question 1 1 pts If R. = 8.0 n and the battery voltage Vo = 21.0 ...

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Question 1 1 pts If R. = 8.0 n and the battery voltage Vo = 21.0 V, what is the current in the 2R resistor ? Module R + R 2R R V0 0.938 A 0.625 A 1.31 A 0.375 A 0.525 A Question 2 1 pts Two large conducting parallel plates A and B are separated by 2.4 m. A uniform field of 1500 V/m, in the positive x- direction, is produced by charges on the plates. The center plane at x = 0.00 m is an equipotential surface on which V = 0. An electron is projected from x = 0.00 m, with an initial velocity of 1.0 X 107 m/s perpendicular to the plates in the positive x- direction, as shown in the figure. What is the kinetic energy of the electron as it reaches plate A ? (e= = 1.60 X 10-19 C, m e 9.11 x 10-31kg) A B E = 1500 V/m ho . - -1.2 m , = + 1.2 m - = 0.00 m +2.4 X 10-16 J -3.3 X 10 -16 J -2.9 X 10 -16 J -16 +3.3 X 10 J -2.4 x 10-10 -16 J Question 3 1 pts A conducting sphere of radius 20.0 cm carries an excess charge of + 15.0 C, and no other charges are present. The potential (relative to infinity) due to this sphere at a point 12.0 cm from its center is closest to zero 9380 kV hot the 1130 kV the 3380 kV the 674 kV Question 4 1 pts An ideal parallel-plate capacitor consists of a set of two parallel plates of area A separated by a very small distance d. When this capacitor is connected to a battery that maintains a constant potential difference between the plates, the energy stored in the capacitor is U.o If the separation between the plates is doubled, how much energy is stored in the capacitor? U 0/2 440 200 W 0/4 Question 5 1 pts An ideal air-filled parallel-plate capacitor has round plates and carries a fixed amount of equal but opposite charge on its plates. All the geometric parameters of the capacitor (plate diameter and plate separation) are now DOUBLED. If the original energy stored in the capacitor was U 0' how much energy does it now store? the 2U 0 U, 0/4 the 4 U. the U 0/2 U. Question 6 1 pts hst What length of a certain metal wire of diameter 0.15 mm is needed for the wire to have a resistance of 15.22 The resistivity of this metal is 1.68 x 10 Q -8 . m. 1.6 m 160 m 16 m 16 cm 16 mm Question 7 1 pts When a voltage difference is applied to a piece of metal wire, a 3-mA current fows through it If this metal wire is now replaced with a silver wire having twice the diameter of the original wire, now much current will flow through the silver wire? The lengths of both wires are the same, and the voltage a difference remains unchanged. (The resistivity of the original metal is 1.68 - 10 o m, and the -8 resistivity of silver is 1.59 x 10 Q.m.) 6.3 mA 3.2 mA 13 mA 26 mA 11 mA Question 8 1 pts How much current will be flowing through a 40.0 m length of cylindrical metal wire with radius 4.0 mm if it -8 is connected to a source supplying 16.0 V? The resistivity of this metal is 1.68 x 10 Q2 - m. 1200 A 68 A 710 A 8 9.5 x 10 A the 68 nA Question 9 1 pts A resistor is made out of a long wire having a length L. Each end of the wire is attached to a terminal of a battery providing a constant voltage Vo. A current I flows through the wire. If therwire were cut in half, making two wires oflength L/2, and both wires were attached to the battery (the end of both wires attached to one terminal, and the other ends attached to the other terminal), what would be the total current flowing through the two wires? 1/4 I I/2 21 41 Two light bulbs, B1 and B2 are connected to a battery having appreciable internal resistance as shown in the figure. What happens to the brightness of bulb B1 when we close the switch S ? B1 1 +/ B hs 2 Q S The brightness of B1 does not change. The brightness of B1 decreases temporarily but gradually increases back to its original brightness. The brightness of B1 increases temporarily but gradually decreases back to its original brightness. The brightness of B1 increases permanently. The brightness of B1 decreases permanently. Question 11 1 pts The emf and the internal resistance of a battery are shown in the figure. If a current of 7.86 A is established through the battery from b to a, what is the terminal voltage (Vab = Vb-Va) - of the battery? 25.0V 7.002 +/1 b 30.0V zero 80.0 V -30.0 V - 80.0 V Question 12 1 pts In the circuit shown in the figure, an ideal ohmmeter is connected across ab with the switch S open. All the connecting leads have negligible resistance. The reading of the ohmmeter will be closest to 10 2 S a 20 2 30 60 9 Q b 100 30 9 40 2 100 60 0 7.5 Q

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