A dynamo is a term used for a generator that works in the following way. By some

Question

A dynamo is a term used for a generator that works in the following way. By some external agency (the shaft of a steam turbine, for example) a conductor is driven through a magnetic field, inducing an electric potential (known as an emf) in a circuit of which the conductor is a part. The source of the magnetic field is the current that is caused to flow in that circuit by the emf. (An electrical engineer would call it a "self-excited generator"). One of the simplest dynamos conceivable, shown in the figure below, has only two essential parts. One 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 one is the dynamo? In which direction, if any, docs the current flow in the dynamo?

Explanation / Answer

the second one is a dynamo and direction of current will be clockwise in the loop that is from rim of metallic disk to the axle.

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