Q1: What is the relationship between the compass needles and the orientation of the field lines? 7. Knock the magnet over onto one of its faces. Q2: Is there any order to the direction of the compass needles now? Please explain.
Added by Matthew F.
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The north end of the compass needle points towards the south pole of the magnet, and the south end of the needle points towards the north pole of the magnet. This indicates that the compass needles are oriented along the direction of the magnetic field lines. Show more…
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Question 1: When a compass needle is in stable equilibrium in a magnetic field B, the needle axis is at 45° to the field: - The south pole points in the positive direction of B. - The north pole points in the positive direction of B. - The needle axis is perpendicular to the field. - None of these occur. Question 8: If the magnetic field vector is directed towards the north and a negatively charged particle is moving towards the west, what is the direction of the magnetic force on the particle? - East - South - Down
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Two compass needles are fixed at the ends of a straw (the north pole of one needle is placed above the south pole of the other needle) and are hung at the end of a light string as shown in Figure $P 20.6 .$ The needles are brought close to a long horizontal wire connected to a circuit, as shown in the figure. (a) How will the needles point after the switch is closed? Explain. (b) Your friend claims that Earth's magnetic field does not affect the two-needle device. Do you agree or disagree? Explain your reasoning.
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Imagine hanging a bunch of bar magnets (horizontally) from different parts of the ceiling (spreading them out), free to rotate. a. After the magnets have stopped rotating, in what directions do you think the magnets will be pointing? b. Start with one of the strong (stacked) magnets and place them either on the floor or on the table/textbook (why?). Obtain a "bunch" of small compasses and array them around the magnet and see in which direction they point. Use the diagram below to sketch the pattern and connect the patterns in a way similar to the way that you did with the electric field. c. Place the magnaprobe near a bar magnet. Observe the direction of the suspended compass in different positions. Draw a 3D diagram if you can. Figure out a way to do this – the magnet obviously can't be on the table or even on the floor. d. Place compasses far away from any known magnets (including other compasses). Observe the direction that the compasses point. How do your observations compare to how the magnaprobe behaves? Be sure to note that the magnaprobe has two different colors. Do the two ends of the magnaprobe behave the same or differently?
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