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It is not entirely clear to me how the diagram relates to the description but this is what it looks like: There is a wheel of radius R in a horizontal plane free to rotate about the z axis, the z axis being in the direction of [itex]\hat k[/itex]. The magnetic field is [itex]\vec B = -B_0\hat k[/itex] and extends over a 'doughnut' area from r to R. When the magnetic field collapses, Faraday's law states that there is an electro-motive force or voltage created in a closed loop which encloses the magnetic field. This emf causes the charges to move. Since the charges are 'pasted' to the rim of the wheel, the emf provides angular acceleration to the wheel.ambuj123 said:
Electromagnetic induction is the process by which a changing magnetic field induces an electric current in a conductor. This phenomenon was first discovered by Michael Faraday in the 1830s.
Electromagnetic induction occurs when a conductor, such as a wire, is placed in a changing magnetic field. The magnetic field will induce a current in the wire, which can then be used to power devices or perform other tasks.
One common application of electromagnetic induction is in the functioning of generators, which convert mechanical energy into electrical energy. This process is also used in devices such as transformers, motors, and induction cooktops.
The strength of the magnetic field, the speed of the change in the field, and the properties of the conductor, such as its length and material, can all affect the amount of induction that occurs. Additionally, the presence of other conductors or magnetic materials in the vicinity can also impact the process.
To solve problems related to electromagnetic induction, you will need to use the equations and principles of electromagnetism, such as Faraday's law and Lenz's law. It is also important to carefully consider the specific variables and conditions given in the problem to accurately solve it.
