According to the dynamo theory which has been used to...

Name: according to the dynamo theory which has been used to describe how magnetic fields are generated in bodies like earth and jupiter the two key mechanisms that are required are rapid rotation 36415
Uploaded: 2022-05-31T12:46:33-08:00
Duration: 1 min 28 s
Channel: Madhur L
Description: according to the dynamo theory which has been used to describe how magnetic fields are generated in bodies like earth and jupiter the two key mechanisms that are required are rapid rotation 36415

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A magnetic dynamo is caused by a combination of convection in a molten core and rotation, as well as cosmic rays from space, lunar tidal action, and the solar gravitational pull on the Earth's equatorial bulge.

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In this question the term dynamo will be used for a generator which works in the following way. By some external agency-the shaft of a steam turbine, for instance- a conductor is driven through a magnetic field, inducing an electromotive force in a circuit of which that conductor is part. The source of the magnetic field is the current which is caused to flow in that circuit by that electromotive force. An electrical engineer would call it a self-excited dc generator. One of the simplest dynamos conceivable is sketched below. It has only two essential parts. One part is a solid metal disk and axle which can be driven in rotation. The other is a two-turn "coil" which is stationary but is connected by sliding contacts, or "brushes," to the axle and to the rim of the revolving disk. One of the two devices pictured is, at least potentially, a dynamo. The other is not. Which is the dynamo? Note that the answer to this question cannot depend on any convention about handedness or current directions. An intelligent extraterrestrial being inspecting the sketches could give the answer, provided only that it knows about arrows! What do you think determines the direction of the current in such a dynamo? What will determine the magnitude of the current?

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