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1 Physics 30 E-Campus Magnetic Forces and Fields Exam Part B Written Response #1 Name: ______________ Use the following information to answer the next question. A teacher performed a classroom demonstration of Lenz’s Law. A strong magnet is mounted on a frictionless dynamics cart so that its north pole (N) is toward the coil. The coil is wrapped around a hollow glass tube. The coil and tube hang freely on conducting wires they can move toward or away from the strong permanent magnet. The conducting wires are connected to an ammeter. Students in the class make the following observations during the demonstration. Observation III As the magnet gets closer to the coil, it slows down. The coil continues to move away from the incoming magnet, swinging away and up from its starting position. The ammeter continues to detect a current. Observation II The teacher pushes the cart toward the coil and releases it. The magnet on the cart moves toward the coil. The coil swings away and up from its starting position. The ammeter detects a current. v 3 < v 2 Ammeter v 2 Ammeter Freely hanging glass tube v i = 0 m/s Strong permanent magnet Cart Coil Ammeter Observation I While the strong permanent magnet is stationary, no current is detected by the ammeter, and the coil and glass tube remain stationary.

2 Analyze Observation II by: (3 marks) Name: ______________  Labeling the north and south magnetic poles induced in the coil.  Draw and label the magnetic field lines around the coil.  Identify the direction of the induced current through the ammeter. Ammeter  Using the Law of Conservation of Energy, explain why the permanent magnet slows down as it gets closer to the coil and why the coil swings up and away from the magnet in observation III. Support your answer by describing the energy conversions in the magnet coil system. (3 marks)

3 Written Response #2 Name: ______________ Use the following information to answer the next question. To determine the strength of a strong horseshoe magnet, Shane and Laura set up equipment as shown below. The equipment is set up so that the motor effect produces a force on a current-carrying wire that is perpendicular to the magnetic field of a strong horseshoe magnet. The wire and its supports are placed on a scale as shown above, and the scale is set to read zero when there is no current in the wire. The length of the wire is perpendicular to the magnetic field of the strong horseshoe magnet is measured to be 0.025 m. As Laura increases the voltage from the variable power supply, Shane records the current and the corresponding scale reading. ? ? ? ? Support Ammeter Variable power supply Scale Wire Strong horseshoe magnet

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4 Name: ______________ Shane and Laura’s teacher has explained to them that the value displayed by the scale will be multiplied by the magnitude of acceleration due to gravity in order to calculate the magnitude of the magnetic force. Their observations are charted below. Current (A) Scale Reading (g) Magnetic Force  10 -3 N) 0.00 0.00 0.00 0.80 0.26 2.55 1.80 0.62 6.08 1.95 0.65 6.38 2.50 0.90 8.83 2.76 0.92 9.03 Analyze Shane and Laura’s experiment and observations by:  Labeling the north and south poles of the horseshoe magnet and the positive and negative terminals of the variable power supply in order to produce the magnetic force on the scale. (2 marks)

5 Name: ______________  Draw a graph of the magnetic force as a function of current. (4 marks) (Title)  Using your graph, determine the strength of the magnetic field produced by the horseshoe magnet. (3 marks)

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7 Use the following information to answer the next bullet. The formula for the magnetic field from a solenoid is where, B represents the magnetic field strength of the solenoid 0  is a constant, I represents the current through the solenoid n represents the number of loops per meter length.  The electron beam is then made to strike the screen at position 2. What two changes were made to the current in the solenoid ? State how each change in the solenoid will affect the electron beam. Use the formulas for a solenoid and magnetic force on a charged particle to support your answer. (3 marks)

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