Question 1 (1 point} J Saved The direction of current flow is shown in the conductor below. What would be the direction of the magnetic field lines around the conductor on the side of the conductor closest to you? In the diagram below, l \\ a?\" O the magnetic field lines between the poles are directed from left to right, the current is flowing away from you into the page, and the wire is forced upward toward the middle of the magnet. G) the magnetic field lines between the poles are directed from right to left, the current is flowing away from you into the page, and the wire is forced upward toward the middle of the magnet. O the magnetic field lines between the poles are directed from right to left, the current is flowing toward you, and the wire is forced downward away from the magnet. Question 3 (1 point] Magnetic forces involved in the motor principle depend on all BUT the following: 0 Length of the conducting wire perpendicular to the magnetic field 0 Amount of current through the wire 0 Potential difference 0 Magnitude of the external magnetic field Question 4 (1 point] Which is true of a step-up transformer? Q There are more loops in the secondary coil 0 There are more loops in the primary coil 0 Voltage is decreased 0 Only one coil Question 5 (1 point} J Saved In a transformer, the secondary current is 3.4 A and the primary current is 2.6 A. If the secondary voltage is 46 V, then what is the primary voltage? Question 6 (2 points) (2 marks] In the two helixes shown below, state whether the current flows from X to Y or from Y to X. Question 7 (6 points} (6 marks] Draw the magnetic field lines and indicate the direction of the magnetic field in each of the following. @006 Question 8 (3 points} (3 marks] Describe how you would use the right-hand rule to determine which side of the helix is the North Pole. Indicate the North Pole on the helix in the diagram below. Question 9 (2 points} (2 marks) Use the domain theory of magnetism to explain the difference between a strong magnet and a weak magnet. Question 10 (4 points) (4 marks) The diagram below shows a simple motor. The loop of wire is attached to the split-ring commutator. a. Does the current flow through the wire from A-B or from B-A? b. The current running through the loop will cause it to spin. Will this cause point A to move up or down? How do you know? c. What is the purpose of the split-ring commutator and why must it be used on the motor for it to work properly? Question 11 (5 points] (5 marks) In the diagram below, the magnet is being pulled out of the coil of wire. This causes a current to be induced in the wire. ( a. Draw an arrow on the wire to indicate the direction in which the current moves. b. Indicate which side of the coil of wire will act as a North Pole and which will act as a South Pole. c. Describe 2 ways in which the induced current could be increased. Question 12 (3 points) (3 marks} Consider the generator below. The part of the wire labeled A is connected to slip ring A, the part of the wire labeled B is connected to slip ring B. a. Is the current flowing in through A and out through B, or the other way around? b. Explain why it is AC electricity that is produced. c. What effect will reversing the two magnets have on the generator and the electricity that is produced? Question 13 (2 points) (2 marks] Electricity is transmitted in high-tension wires with a voltage of 500 W. The voltage in our homes is only 120 V. Explain why we don't just transmit the electricity at 120 V to save the cost and effort needed to stepdown the voltage. Question 14 [8 points] (8 marks] Not all of the turns of wire are shown in the transformer below. The primary coil contains 1 800 turns and has an input voltage of 240 V. The secondary coil has 90 turns of wire and an output current of 45 A. a. What is the output voltage? b. Is this a step-up or a stepdown transformer? c. What is the output power? d. What is the input current? Question 15 {2 points] (3 marks) When a certain electromagnet contains 1000 turns in its length and carries a current of 10 A, it can lift a 200 kg load. If the electromagnet is rewound such that it contains 5000 turns, but only carries a current of 5 A, how large a load could it lift