![]() ![]() Consider the area enclosed by the moving rod, rails, and resistor. The resistor could be anything from a light bulb to a voltmeter. The rails are stationary relative to B and are connected to a stationary resistor R. A rod is moved at a speed v along a pair of conducting rails separated by a distance ℓ in a uniform magnetic field B. Consider the situation shown in Figure 1. We will now see that the Hall effect is one aspect of the broader phenomenon of induction, and we will find that motional emf can be used as a power source. We saw that the Hall effect has applications, including measurements of B and v. Charges moving in a magnetic field experience the magnetic force F = qvB sin θ, which moves opposite charges in opposite directions and produces an em f = Bℓv. One situation where motional emf occurs is known as the Hall effect and has already been examined. In this section, we concentrate on motion in a magnetic field that is stationary relative to the Earth, producing what is loosely called motional emf. ![]() For example, a magnet moved toward a coil induces an emf, and a coil moved toward a magnet produces a similar emf. Motion is one of the major causes of induction. Calculate emf, force, magnetic field, and work due to the motion of an object in a magnetic field.Īs we have seen, any change in magnetic flux induces an emf opposing that change-a process known as induction. ![]() By the end of this section, you will be able to:
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