1. A solenoid is a powerful magnet that is created by looping a conductor and passing a current through the conductor.

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1 Electricity and Magnetism Unit Test /60 Part A: True/False [5 K/U] In the blank provided, identify if the statement is true or false. If the statement is false, identify and correct the portion that is false for full marks. 1. A solenoid is a powerful magnet that is created by looping a conductor and passing a current through the conductor. 2. A resistor is a specific material that slows down current flow. 3. When a short circuit occurs, the circuit and source may heat / flare up and explode if not treated properly. 4. The right-hand rule is used to determine the direction of an electric field produced by a magnet. 5. Kirchhoff created three laws to describe how current and potential change through a circuit. Part B: Multiple Choice [15 K/U] Fill in the most correct answer into the Scantron card provided. If enough time is present, circle the most correct answer as well. 1. In the equation P = VI, what does the variable I represent? a. Intensity b. Current c. Voltage d. Incandescence 2. The magnetic field around a straight current-carrying conductor creates the shape of a. A sinusoidal curve b. An ellipse c. Concentric Circles d. No shape is produced 3. What is the potential difference across a toaster of resistance 13.8Ω when the current through it is 8.7A? a. 120 V b. 130 V c. 115 V d V

2 For the next three questions, refer to the following circuit diagram to answer. 4. This circuit consists of two different elements. What are the two elements? a. Ammeter and voltmeter b. Resister and battery c. Resister and lightbulb d. Battery and switch 5. Objects 1 and 3 are in a. Series b. Parallel c. Series and Parallel d. Completely different circuits 6. To reduce objects 2 and 4 to one equivalent object we would use which formula? a. 1 R t = 1 R R 4 b. R t = R 2 + R 4 c. 1 R t = 1 R 4 1 R 2 d. R t = R 2 = R 4 7. Kirchhoff s Voltage Law states that in a parallel circuit a. The potential difference is double across each load. b. The loads share the potential difference. c. The current splits depending on the number of paths. d. The potential difference is the same across each load.

3 8. When the process of magnetic induction occurs, what are the atoms called that align to create a temporary magnet? a. Dipoles b. Ferromagnets c. Magnetic domain d. Electrons 9. To measure current, we use an ammeter and it must be connected in a. Parallel b. Series c. Randomly d. It doesn t need to be connected to measure current 10. When using the right-hand rule for the motor principle, your thumb points in the direction of what? a. Force b. External Magnetic Field c. Current d. Electron flow 11. Which of the following are not a property that can be changed to strengthen or weaken the magnetic field of a solenoid? a. Current b. Core Material c. Number of loops d. Potential difference 12. Pole X repels pole Y. Pole Y attracts pole Z. Pole Z is repelled by a north pole. The polarity of X, Y, Z are: a. S, S, N b. S, N, N c. N, N, N d. N, N, S 13. The graphs below show V vs I for various conductors. Which of the graphs shows an ohmic conductor?

4 14. Two current-carrying conductors are suspended next to one another. The arrows indicate current flow. Which of the following would be the expected results. a. pushed apart pushed apart b. pushed apart pushed together c. pushed together pushed apart d. pushed together pushed together 15. Which of the following is not a property of magnetic field lines? a. Point from N to S outside and S to N inside b. Never cross one another c. Are closer together when the magnetic field is weaker d. Are invisible Part C: Application [10 A + 6C] Ensure all answers are in full sentences and accurately explain the theory behind your answer. 1. In a lab practical test, your teacher hands you three resistors that are labelled, but one label is incorrect. You must design a signal circuit with no more than four instruments to determine which resistor is incorrectly labelled. Draw a circuit diagram showing how you would solve the problem, and describe your solution. [4A + 2C]

5 2. Explain how magnetic relay devices operate. The picture below is to aid you description. Begin your description with, When the switch is closed, electric current from the batter flows. [2A + 2C] 3. Briefly describe what is incorrect about the below diagram and how you know it s incorrect. Correct the part of the diagram that is incorrect as well. [2A + 1C] 4. In detail, compare and contrast direct current and alternating current. [2A + 1C]

6 Part D: Calculations and Thinking [24 TI] 1. A 15A circuit breaker is used in a 120V household circuit. a. What is the maximum power available in this circuit? [2 TI] b. What is the maximum number of 60W light bulbs that can operate at the same time on this circuit? [2 TI] 2. Calculate the effect on the strength of the magnetic field in a coil when the following changes occur. [2 TI each] a. The core is changed from iron with a permeability of 2000 to steel with a permeability of b. The current in the coil is decreased from 7.0A to 5.0A. 3. Indicate the missing information. It may be either the direction of the current, the N- S poles, or the force on the conductor. [1 TI each]

7 4. You will have to draw the following circuit and complete a circuit analysis. a. Draw the circuit diagram that has the following properties: [3 TI] Four resistors are present in this circuit R 1 = 60Ω, R 2 = 20Ω, R 3 = 60Ω and R 4 = 28Ω Resistors 1 through 3 are connected in parallel Resistor 4 is connected in series with the resistors in parallel The battery has a voltage of 120V b. Find both the current and the potential drop across each resistor. [10 TI]

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