Field of a cylindrical bar magnet calculated with Ampère's model. Two models are used to calculate the magnetic fields of and the forces between magnets.
1, when a bar magnet is placed in a magnetic field B, the net magnetic force on the bar magnet is zero.
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The magnetic field lines of a bar magnet can be traced out with the use of a compass. The needle of a compass is itself a permanent magnet and the north indicator of the compass is a magnetic north pole.
We will then solve the two equations simultaneously. The pole strength of a bar magnet may be determined by measuring the force F exerted on one pole of the magnet by an external magnetic field B0.
(iii) If magnetic field is uniform, the magnetic lines of force are equidistant. Torque on a Bar Magnet in a magnetic field.
Important Equations and People.
Magnetic fields and lines of force. A bar magnet attracts iron objects to its ends, called poles.
Iron filings lining up along magnetic field lines in a bar magnet. Below are 2 diagrams of the field lines of magnets attracting and repelling.
Figure 6.3 Field patterns for pairs of bar magnets. E6: Magnetism - Fields and Forces.