1 of 15 Concept Tests Final Review CTF 1 Calculator question 105 A 1E5 B 10E5 C something else CTF 2 A cube is made larger and larger area As the cube grows the ratio volume A increases B decreases C remains constant Phys1120 Dubson University of Colorado at Boulder 2 of 15 CTF 3 A box with mass M and charge Q is pushed along a rough surface at constant velocity by a uniform horizontal electric field of magnitude E The coefficient of kinetic friction between the box and the floor is What is the net force on the box A QE B g D QE Mg FN Mg C QE Mg E None of these M Q E v constant Phys1120 Dubson University of Colorado at Boulder 3 of 15 CTF 4 A row of positive charges is stationary on the ground A person with a gauss meter which measures the magnetic field is running to the right along the row of charges at the same height as the charges and in front of them in the diagram below Does the person measure a non zero B field A Yes B No v What is the direction of the B field which the moving observer measures A Up B Down C Forward direction D backward direction E no direction B field zero Phys1120 Dubson University of Colorado at Boulder 4 of 15 CTF 5 A charge q is located at the center of an gaussian cubical box as shown A student is asked What is the electric flux E though the top face of the cube Is the answer hard to calculate or easy to calculate A Easy B Hard q CTF 6 A capacitor with capacitance C is attached to a G G battery with voltage V What is the flux E da through the cubical volume shown The end faces of the cube are within the metal plates of the capacitor z C CV A o 2CV B o C zero D None of these V Phys1120 Dubson University of Colorado at Boulder 5 of 15 CTF 7 Points A and B are distances r and 3r respectively from a point charge q What is the voltage difference between points A and B r q 2kq A 3r 2r A kq B 3r B 8 kq C 9 r 3kq D 4r E None CTF 8 Consider a point in empty space near several charges which might be positive negative or both Consider the following statements I The E field can be zero while the voltage is non zero II The voltage can be zero while the E field is non zero Which of these statements can be true A both can be true B neither can be true C only I can be true D only II can by true Phys1120 Dubson University of Colorado at Boulder 6 of 15 CTF 9 A capacitor has a voltage V across its plates An electron initially at rest is released from at a point very close to the negative plate of a capacitor and it accelerates toward the positive plate The electron has charge e and mass m There is no gravity in this problem What is the final kinetic energy of the electron just before it collides with the positive plate A m e V B 2eV C 1 2 mV2 D eV E None of these V Phys1120 Dubson University of Colorado at Boulder 7 of 15 CTF 10 A resistor with resistance R is plugged into a 120VAC wall socket The graph below is either resistance R voltage V across current I thru or power P dissipated in the resistor vs time time What could the graph be A V only B I only C V or I only D V I or P E Some other combination Phys1120 Dubson University of Colorado at Boulder 8 of 15 CTF 11 Consider the circuit shown with the switch initially open When the switch is closed the current I1 through resistor R1 A increases B decreases C stays the same I bat V R1 I1 R2 When the switch is closed the current from the battery Ibat A increases B decreases Phys1120 Dubson C stays the same University of Colorado at Boulder 9 of 15 CTF 12 When a resistor is plugged into a standard AC outlet the fuse blows and all the lights go out If we want to repeat this dangerous experiment and not have the fuse blow we need a resistor that is A larger B smaller C Same R but larger power rating CTF 13 A charge q is released from rest at point in empty space were there may be E and or Bfields There are no forces on the charge except for the forces due to the E and or B fields no gravity etc The charge is observed for a short while and is seen to move along a curved path q Consider the following possibilities I There is only an E field present and no B field II There is only a B field present and no E field III There is both an E field and a B field present Which possibilities could account for the observed motion A all three B I and III only C II and III D III only Phys1120 Dubson University of Colorado at Boulder 10 of 15 CTF 14 At time to a particle with charge q has G instantaneous velocity vo as shown and is moving in a JG uniform magnetic field B A True or B False V B y q x As time increases the x component of the velocity vx remains constant A True or B False The KE of the particle remains constant as time increases CTF 15 A long solenoid with many turns per length has a uniform magnetic field B within its interior Consider the imaginary rectangular path of length c and width a with one edge entirely within the solenoid as shown c G G a What is B dl z B A Bc B 2B c a D None of these C 2Bc The solenoid has n turns per length and carries a current I G G What is B dl B o ncI C o n a c I A o nI D None of these z Phys1120 Dubson University of Colorado at Boulder 11 of 15 CTF 16 A horizontal loop of wire is in a vertical magnetic field caused by an external magnet The magnetic field varies smoothly from pointing upward to pointing downward as shown The B field gradually gets smaller goes to zero then grows in the other direction At the moment when the external magnetic field in the loop is zero is there an induced current in the loop A Yes B No At the moment when the external B field in the loop is zero what is the direction of the induced current A Clockwise as seen from above B Counterclockwise C No direction because induced current is reversing Phys1120 Dubson University of Colorado at Boulder 12 of 15 CTF 17 A single circular loop …
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