Moving a ____ through a magnetic field induces electrical current in that conductor. Wire Rubber tube Glass Magnet
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1. A constant magnetic field can induce an emf (an emf is like battery voltage which can power a circuit). 2. An emf (and therefore current as well) can be induced in various processes that involve a change in magnetic flux without changing the line density of the flux. When a magnetic bar is moving toward a loop of wire, current will be induced in the wire. 3. When a magnetic bar is static inside a loop of wire, current will be induced in the wire if the loop moves. 4. When a magnetic bar is leaving a loop of wire, no current will be induced in the wire. 5. The path of a charged particle in a magnetic field is always described by the equation r = a;8, where r is the radius of the deflection. 6. The earth's magnetic field interacts with atmospheric charged particles.
Sri K.
A metal wire is resting on a U-shaped conducting rail, as shown in the figure. The rail is fixed in position, but the wire is free to move. a) If the magnetic field B is increasing in strength, in which direction is the induced current? In which way does the wire move? Explain. b) Now, suppose the B-field remains constant at B = 0.053 T. If the wire has a length l = 0.42 m, at what speed must the wire move to create an induced emf of 3.17 V?
Khoobchandra A.
A popular demonstration of eddy currents involves dropping a magnet down a long metal tube and a long glass or plastic tube. As the magnet falls through a tube, the magnetic flux changes as the magnet moves toward or away from each part of the tube. a) Which tube has the larger voltage induced in it? b) Which tube has the larger eddy currents induced in it?
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