Transcription of 5.1. The Magnetic Field - University of Rochester
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5.1. The Magnetic Field - University of Rochester
- 1 -Chapter 5. The Magnetic FieldConsider two parallel straight wires in which current is flowing. The wires are neutral andtherefore there is no net electric force between the wires. Nevertheless, if the current in bothwires is flowing in the same direction, the wires are found to attract each other. If the current inone of the wires is reversed, the wires are found to repel each other. The force responsible forthe attraction and repulsion is called the Magnetic force. The Magnetic force acting on a movingcharge q is defined in terms of the Magnetic Field :F Magnetic =qv B ()The vector product is required since observations show that the force acting on a moving chargeis perpendicular to the direction of the moving charge.
Find the magnetic field at point P for each of the steady current configurations shown in Figure 5.3. a) The total magnetic field at P is the vector sum of the magnetic fields produced by the four segments of the current loop. Along the two straight sections of the loop, r ˆ and dl are parallel or opposite, and thus dl ¥ r ˆ = 0. Therefore ...
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