Circle the closest answer and Bubble in questions 1 15 ON YOUR BUBBLE SHEET 0 Bubble in your name your correct Student ID number onto your bubble sheet If you leave your ID number blank do not bubble it in or bubble it in incorrectly we will deduct a point from your exam score If you are not certain about your number please see an instructor To ensure accurate grading bubble your Exam version number 0001 in the 1234 column on the bubble sheet 1 A circuit with a battery two identical lightbulbs and a switch is shown to the right Initially the switch is open as shown to the right If the switch is closed what happens to the current that passes through the circuits at points P and Q A Both stay the same Q P Switch B Both increase C IP stays the same IQ increases D IP increases IQ stays the same E IP decreases IQ stays the same 2 Two capacitors 2 F and 4 F are shown on the right connected to a 6 V battery What is the potential difference across the 2 F capacitor Assume it is a long time after they were connected to the battery 2 F 6V 4 F A 6 V B 4 V C 3 V D 2 V E 1 V Spring 2012 E2 4 V1 First Midterm 3 A negative charge q is placed between charged plates as shown in the figure to the right The charge starts at an initial position near the negative plate and is moved to a final position close to the positive plate Did the electric potential energy U increase decrease Did the potential at the location of the negative charge V increase decrease A U and V increased B U and V decreased C U increased and V decreased D U decreased and V increased E initial q final 4 Suppose a region of space has a uniform electric field directed downwards as shown Three points are labeled A B and C Points B and C are on the same horizontal line Which statement is correct A The voltage at all three locations is the same B The voltage at points B and C are equal and the voltage at point B is higher than the voltage at point A C The voltage at points B and C are equal and the voltage at point B is lower than the voltage at point A D The voltage at point A is the highest the voltage at point C is the second highest and the voltage at point B is the lowest E None of the above 5 Two metal conducting spheres are connected by an ideal wire The combined system has a total positive charge of 15 C and sphere 1 has a radius of 10 cm while sphere 2 has a radius of 20 cm Assume that the spheres are far apart and that they have been connected for a long time What can you say about the charge on each sphere Q1 and Q2 A Q1 7 5 C Q2 7 5 C B Q1 10 C Q2 5 C 10cm Sphere 1 C Q1 5 C Q2 10 C Sphere 2 wire D Q1 3 C Q2 12 C 20cm E Q1 12 C Q2 3 C Spring 2012 E2 5 V1 First Midterm ay d ay y x 6 An electron mass 9x10 31 kg charge 1 6x10 19 C is initially moving along the x axis with speed v It travels between two parallel plates that have a potential difference of 5x10 6 V and are separated by a distance d 0 2 m The electron is deflected in the y direction What is the y component of its acceleration while it is in the region between the plates Do not include gravity A 4 44x106 m s2 B 2 25x10 7 m s C 8 89x105 m s2 D 1 78x105 m s2 E 5 0x10 6 m s2 7 In class you saw a pickle light up like a light bulb It was plugged into the 120 V outlet and was as bright as 30 W lightbulb so let s assume that the pickle dissipated 30 W of power What is the approximate resistance of the pickle A 960 B 480 C 4 D 0 250 E 2 083x10 3 8 Each resistor in the circuit shown below has a resistance of R What is the equivalent resistance of the circuit that is the total resistance between points A and B A 4R 3 B 3R C 3R 2 D 2R E 2R 3 Spring 2012 E2 6 V1 First Midterm 9 The circuit on the right contains a 12 V battery and three 1 resistors What is the total power dissipated in this circuit Assume an ideal battery and perfect wires 12 V 1 A 432 W 1 B 144 W C 48 W 1 D 96 W E None of the above 10 A parallel plate capacitor with adjustable plate separation d and adjustable area A is connected to a battery The capacitor is fully charged to Q Coulombs and a potential difference of V Volts Which of the following statements are true I With the capacitor connected to the battery increasing the separation d will have no effect on Q II With the capacitor connected to the battery increasing the area A will increase U III After being disconnected from the battery increasing d increases V A I II and III B II only C II and III D I and II E none of the above 11 A parallel plate capacitor consists of two charged metal plates and a neutral plastic block with dielectric constant 1 as shown below How does the magnitude of the E field inside the plastic EBlock compare with the magnitude of the E field in the air between the plates EAir A EBlock 0 EAir 0 plastic block 1 B 0 EBlock EAir metal plate with charge Q C 0 EBlock EAir metal plate with charge Q D 0 EAir EBlock E 0 EAir EBlock ir Spring 2012 E2 7 V1 Block First Midterm The next two questions refer to the diagram shown below Four identical light bulbs are connected to a battery as shown below Assume an ideal battery and perfect wires A V B C D 12 How does the brightness of Bulb A compare to Bulb C A Bulb A is brighter B Bulb C is brighter C They are equally bright D Impossible to tell 13 Which is the brightest bulb A Bulb A B Bulb B C Bulb C D Bulb D E There is a tie for the brightest Spring 2012 E2 8 V1 First Midterm 14 A wire with resistance R1 is cut into four equal length pieces and a new resistor R2 is made by pressing the four pieces side by side as shown What is the ratio R2 R1 A 4 B 1 4 C 1 16 D 1 64 E 16 15 See the circuit diagram shown below Which one of the following …
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