PHYS 1120 Spring 2025 Exam 2 TEST VERSION A Name Student ID Turn off and put away your phone and smartwatch Please do not open the exam until you are asked to Check each box as you complete the instructions Clearly print your full name and student ID number above on this booklet Clearly print your full name and student ID number on your bubble sheet Bubble in version A on your bubble sheet Please circle your tutorial section below and sign the honor code pledge Show all your work and circle your answers on this exam booklet Failure to do so may result in a zero grade on the exam Your circled answers and bubbled answers must agree On your bubble sheet use pencil erase mistakes thoroughly and make no extraneous marks When you finish turn in both your exam booklet and your bubble sheet Then pick up a new bubble sheet for the group exam and then return to your seat Recitation Section and Time Sec 414 11 15 12 05 TA Name Ben Bobell Sean Driskill Matthew Fox Johnny Gallagher Henry Jordan Jiazheng Li Yun Ma Joe McCarty Maxime Pindrys Johannes Reinking Katherine Slattery Matthew Steele Sec 406 9 05 9 55 Sec 419 12 20 1 10 Sec 429 3 35 4 25 Sec 418 12 20 1 10 Sec 417 12 20 1 10 Sec 401 8 00 8 50 Sec 407 9 05 9 55 Sec 403 8 00 8 50 Sec 428 2 30 3 20 Sec 405 9 05 9 55 Sec 402 8 00 8 55 Sec 412 10 00 11 00 Signature Sec 410 10 10 11 00 Sec 434 4 40 5 30 Sec 423 1 25 2 15 Sec 421 1 25 2 15 Sec 408 9 05 9 55 Sec 432 3 35 4 25 Sec 411 10 10 11 00 Sec 430 3 35 4 25 Sec 409 10 10 11 00 Sec 420 12 20 1 10 Sec 416 11 15 12 05 Sec 431 3 35 4 25 Sec 425 2 30 3 20 Sec 426 2 30 3 20 Sec 435 4 40 5 30 Sec 415 11 15 12 05 Sec 433 4 40 5 35 Sec 413 11 15 12 05 Sec 422 1 25 2 15 Sec 424 1 25 2 15 Sec 427 2 30 3 20 By handing in this exam you agree to the following statement On my honor as a University of Colorado Student I have neither given nor received unauthorized assistance on this work Exam 2 cont 2 of 10 The exam consists of 22 multiple choice questions Allowed material Hand written equation sheet one piece front and back of letter sized paper pencils and erasers Calculators are allowed but phones and smart watches are not and must be turned off and put away Note In all questions unless otherwise stated neglect air resistance and assume all wires and batteries are ideal Also unless otherwise stated assume all light bulbs and resistors are Ohmic Possibly useful information g 9 8 m s2 e 1 60 10 19 C k 8 99 109 N m2 C2 0 8 85 10 12 C2 N m2 me 9 11 10 31 kg Physics 1 Equations Fnet m a v v0 a t 1 2 x v0 t v2 v2 0 2a x F d r WF a t 2 The last page of this booklet is for scratch work Version A Exam 2 cont 3 of 10 0 Ensure that you have printed your full name and student ID number with clear and neat handwriting on both the front page of this exam AND on your bubble sheet Your student ID number is not written on your BuffOne Card Bubble in version A on your bubble sheet Failure to follow these instructions may result in the loss of one point on this exam 1 The battery in your car provides 12 V to start the engine If the starter motor has a resistance of 0 25 ohms what is the current in the starter motor when it is on A 48 A B 24 A C 12 A D 6 A E 3 A 2 Which of the following capacitor combinations have an equivalent capacitance of 6 F between the top and bottom wires 3 The voltage electric potential V x in a certain region of space is given by V x 2 V m x 5 V What is the x component of the electric field at x 3 m E More than one A 6 N C B 2 N C C 1 N C D 2 N C E 6 N C 4 Two identical bulbs A and B are connected to an ideal battery as shown Initially the switch is open What happens to the power produced by the battery once the switch is closed A B C D E Power is the same as when the switch was open Power increases by a factor of 4 Power increases by a factor of 2 Power decreases by a factor of 1 2 Power decreases by a factor of 1 4 Version A Exam 2 cont 4 of 10 5 Two charges Qo and Qo are fixed in place at the positions shown Four points A B C and D are labeled on the diagram As usual we set the zero of voltage at r Rank the voltages at the four points 6 Which of the following equations are correct for the circuit shown given the current directions defined in the Figure A B C D E VC VB VD VA VC VB VA VD VA VB VC VD VA VC VB VD VA VC VB VD I1 I2 I3 V1 V2 I1R1 0 V2 I3R2 I3R3 0 A B C D More than one is correct E None are correct A B C Bulb A Bulb B They are equally bright 7 Two lightbulbs A and B are initially connected in series to an ideal battery and Bulb A is observed be brighter as shown The same bulbs A and B are then reconnected in parallel to the same battery When they are in parallel which bulb is brighter Version A Exam 2 cont 5 of 10 8 Three point charges are placed along the x axis as shown What is the magnitude of the net electric force on the charge on the right the one that has charge 2Q A kQ2 d2 B 2kQ2 d2 C 2kQ2 3d2 D 5kQ2 6d2 E 3kQ2 2d2 9 A thin rod of length L carries a negative charge Q distributed uniformly along its length It sits along the y axis with one end at the origin Which equation describes the voltage electrical potential due to this rod at a point on the y axis a distance a below the origin Assume that the voltage is zero far away from the rod A B C D E A B C D E k k Q a Q L2 L 0 0 L k k L a y 2 dy Q Q dy L a y None of …
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