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Assessment Instruction: Write the letter of the correct answer on a separate sheet of paper. 1. A conducting loop of wire with radius r is placed in an increasing magnetic field B directed into the page as shown below. What is the direction of the induced current of the wire? A. clockwise XXXXXXX B. counterclockwise X X X X/> C. down X X/X X X XXXXXX D. up XXXX X X X X XX X XXXXXXX 2. A magnet is slowly descending into a loop of wire. What is the direction of induced current?A. clockwise C. downwards B. counterclockwise D. upwards 3. Which of the following laws is used to find the direction of the induced current in a loop of wire placed in a changing magnetic field? A. Lenz's Law C. Ampere's Law B. Gauss's Law D. Faraday's Law 4. What law is the restatement of Lenz's law which concerns the direction of an induced current in a conductor by a magnetic field? A. Law of Kinetic Energy C. Law of Potential Energy B. Law of Mechanical Energy D. Law of Conservation of Energy 5. A circular loop of wire is placed in a magnetic field as shown below. What is the direction of the induced current if the magnetic field is increasing? A. clockwise B. into the page C. out of the page D. counterclockwise 6. Two different wire loops are concentric and lie in the same plane. The current in the outer loop (I) is clockwise and increases with time. What is the direction of the induced current in the inner loop? A. left C. clockwise B. right D. counterclockwise 7. Why do power companies supply AC not DC? They do not supply DC because it is A. no longer needed C. not using batteries anymore B. more dangerous than AC D. easier to transmit AC than DC 8. What is the work of the frame of DC machines? A. carry the flux C. carry the current B. reduce the flux D. reduce the voltage 9. In an oscillating system, a restoring force is a must. What provides the restoring force in an LC circuit? A. inductor C. resistor B. capacitor D. power source 10. A capacitor in an ideal LC circuit is fully charged by a DC source, then it is disconnected from the DC source. What will happen to the current in the circuit? A. oscillate infinitely C. decays monotonically B. grows monotonically D. becomes zero instantaneously 1 1. At an instant of time during the oscillations of an LC circuit, the current is at its maximum value. What is the voltage across the capacitor at this instant? A. zero C. maximum value B. minimum value D. different from that across the inductor 12. At an instant of time during the oscillations of an LC circuit, the current is momentarily zero. What is the voltage across the capacitor at this instant? A. zero C. maximum value B. minimum value D. different from that across the inductor13. You wish to move a rectangular loop of wire into a region of uniform magnetic field at a given speed so as to induce an emf in the loop. The plane of the loop remains perpendicular to the magnetic field lines. In which orientation should you hold the loop while you move it into the region of magnetic field in order to generate the largest emf? It should be with the dimension of the loop _ to the velocity. A. short; parallel C. long; parallel B. short; perpendicular D. long; perpendicular 14. What is the direction of the magnetic field at point N? A. down C. right B. left D. up 15. The two circular wire loops below lie on the same axis. Which of the following is true of the induced current in loop Y, if the current I in loop X is increasing linearly with respect to time? X 0 0 The induced current in loop Y is in direction of that in loop X and A. the same; constant C. opposite; constant B. the same; increasing D. opposite; increasing