1) The rigid wire XY or magnet can be moved about in the space between the magnets as shown in the diagram. Which of the following movements would produce the greatest reading on the galvanometer? a) wire move downwards, quickly b) wire and magnet move upwards quickly c) wire move downwards and magnet move upwards quickly d) wire and magnet move downwards quickly 2) A straight wire AB is moved across a magnetic field as shown. Which of the following is correct? a) A is at higher potential than B b) B is at higher potential than A c) Induced current flows from B to A d) Induced current flows from A to B 3) Suppose you hold a circular wire coil perpendicular to a magnetic field and then squeeze it into a narrow oval coil, as shown in the diagram. Which of the following gives the highest magetic flux through coil? Explain your answer. a) cicular wire coil with constant magnetic field b) coil squeezed into oval shape with constant magnetic field c) circular wire coil with increased magnetic field strength d) coil squeezed into oval with increased magnetic field strength 4) The N pole of a bar magnet is pushed into a soleniod, as shown in the diagram. An electromotive force is induced in the coil. The galvanometer deflects to the left. Which action, using the same end of the solenoid, would produce a deflection in the same direction? a) Pulling a N pole out of the solenoid b) Pushing a S pole into the solenoid c) Pulling the solenoid away from a N pole d) Pulling the solenoid away from a S pole 5) The diagram shows a permanent magnet moving up and down on the end of a spring. The movement of the magnet induces an e.m.f. in the coil. Which factor, on its own, would decrease the maximum value of the induced e.m.f.? a) Increasing the number of turns on the coil b) Increasing the strength of the magnet c) Raising the coil d) Raising the support of the spring 6) The diagram shows a metal bar swinging like a pendulum to and fro across an uniform magnetic field. The motion produces an induced e.m.f. in the bar. Which graph could represent this e.m.f. during one complete to-and-fro oscillation of the bar, starting at position O? a) A b) B c) C d) D 7) An aluminum plate pivoted at P is allowed to swing into a magnetic field between two horseshoe magnets as shown. Which of the following is true? 1.An anticlockwise current flows in the plate. 2.A repulsive force is experienced by the plate. 3.The plate oscillates between the magnet and comes to a stop. a) 1 only b) 2 only c) 1 and 2 only d) 1, 2 and 3 only 8) A copper ring is dropped over a bar magnet as shown in the diagram below. Which of the following statement about the induced current in the ring is correct? a) It flows in the clockwise direction b) It flows in the anticlockwise direction c) It flows in the clockwise direction and then the anticlockwise direction. d) It flows in the anticlockwise direction and then the clockwise direction. 9) A copper ring is dropped over a bar magnet as shown in the diagram below. Which of the following statement about its acceleration a of the fall at position 1, 2 and 3 is correct? a) a=g a>g a<g b) a>g a=g a<g c) a<g a>g a=g d) a<g a=g a<g 10) Which of the following action will induce a current in the clockwise direction in the external circuit? a) moving the wire downwards b) moving the magnet upwards c) moving the magnet downwards d) moving both the magnet and wire downwards 11) The diagram shows a metal bar swinging like a pendulum to and fro across an uniform magnetic field. The motion produces an induced e.m.f. in the bar. Which of the following is correct as wire rod moves in direction OPQ? O and Q are the maximum displaced position and P is the equilibrium position. a) O is a at a lower potential than R b) P is at a lower potential than R c) P is at a higher potential than R d) Q is a higher potential than R

EMI_Quiz_2011

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