4U 3.10 Magnetic Field Simulations (printable)

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Name: ___________________________ SPH4U Magnetic Field Simulations Magnetic Field Simulation A: https://kforinas.pages.iu.edu/physlets/magnetism/magnetA.html 1. Move the magnet and compass around to several different locations. a) Place the magnet in the centre of the window and double-click on the blank white area near the magnet. Magnetic field lines should appear. Repeat this many times to make a magnetic field line diagram and sketch it in the space below. b) What can you conclude about the compass needle orientation relative to the north and south poles of the magnet? 2. Hold the mouse button down and drag the mouse around the simulation while noting the magnitude of the magnetic field, B . a) What can you conclude about the magnetic field strength as you move away from the north pole? b) How does this compare with the field strength as you move away from the south pole? c) How does this compare with the field strength as you move away from the centre of the magnet? 3. Double-click in 6 or 8 locations near the magnet to cause the simulation to draw the magnetic field lines. Drag the compass around and note the direction of the compass needle.

What is the relationship between the direction of the needle and the direction of the field lines? Magnetic Field Simulation B: https://kforinas.pages.iu.edu/physlets/magnetism/magnetB.html 4. Double-click in several locations in the simulation to create magnetic field lines. What is the relationship between the magnetic field lines and the magnetic force vectors? 5. Click the “Parallel” button to reset the simulation. Drag the magnets around, looking at the magnetic field vectors. What happens to the magnetic field strength when you place one magnet directly on top of the other? 6. Click the “Anti-Parallel” button to reset the simulation. Drag the magnets around, looking at the magnetic field vectors. What happens to the magnetic field strength when you place one magnet directly on top of the other in this case? 7. Click the “Parallel” button to reset the simulation. Hold the mouse button down and drag it around in the area between the magnets, noting the magnetic field strength (in the yellow box) at the midway point between the two magnets. Repeat these observations for the “Anti-Parallel” magnets. a) What can you conclude about the strength of the magnetic field between the two magnets in each case?

b) In which case is the field between the magnets strongest? Magnetic Field Simulation C: https://kforinas.pages.iu.edu/physlets/magnetism/magnetC.html 8. From the direction of the compass needle (move it around) , visualize the field vectors in the area around the two wires. Describe the differences between this field and the field for the two bar magnets from Simulation B. 9. Based on the right-hand rule and the direction of the field vectors you just drew, which direction does the current flow in each of the wires? 10. Which wire has more current flowing in it? How do you know? Magnetic Field Simulation D: https://kforinas.pages.iu.edu/physlets/magnetism/magnetD.html 11. For each case (A, B and C ) determine which direction the currents flow and which wire (left or right) has the most current. Explain your reasoning. Case A:

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Case B: Case C: 12. Click on the “Three Wires” button to add another wire to the simulation. You may move the wires around with the mouse. Double-click in the simulation to show the magnetic field lines. State the direction of current flow for each wire and explain your reasoning. Magnetic Field Simulation E: https://kforinas.pages.iu.edu/physlets/magnetism/magnetE.html 13. Double-click in the simulation to show the magnetic field lines. Sketch the field lines below . How does the direction of the compass needle correspond to the field lines? Magnetic Field Simulation H: https://kforinas.pages.iu.edu/physlets/magnetism/magnetH.html 14 . The single stationary charge is not moving within the magnetic field. a) Explain why the charge remains stationary. b) What would the charge do if the field had been electric rather than magnetic?

15 . Press the “Moving Charge – Case 1” button. Explain the motion of the moving charge. Why is it not deflected? 16 . Press the “Moving Charges – Case 2” button. Explain why each object travels along a different path. 17 . Press the “Double the Field” button. Describe the difference in motion of each of the three charges compared to the last case. 18 . Press the “+Q, +2Q, and +3Q” button. a) Describe the difference in motion of each of the three charges. b) Which has the greater force acting on it? c) Which has the greater speed?

19 . Press the “v, 2v, and 3v” button. a) Which direction does the magnetic field point in this case? b) Describe the difference in the motion of the three charges. c) Which has the greater force acting on it?

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