Active Figure 29.1 Compass needles can be used to trace the magnetic field lines in the region outside a bar magnet. - ppt download
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Explain the method of plotting magnetic field lines by using a small compass needle.
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Physics for Secondary Schools. Book Four (Tanzania Institute of Education, 1995, 218 p.): Chapter 1: Magnetic Effect of Electric Current: 1.1 Magnetic fields due to current-carrying conductors: 1.1.1 Magnetic fields due to a straight wire