Question

Draw a neat diagram of AC dynamo and represent the current in it in the external circuit by a graph.

Answer 1

Hint: Faraday's Laws of electromagnetic induction is the working principal for AC Generator. According to Faraday's Laws of electromagnetic induction, an emf is induced across the ends of the loop ,when there is change of magnetic flux through a conductor loop. The E.M.F induced is such that it opposes the cause that induced it. The current induced is given as negative of rate of change of magnetic flux through the circuit.

Complete step-by-step answer:

Here we see a diagram of AC dynamo,
We see two strong permanent magnets which are fixed and placed with their opposite poles facing each other. A structure of soft iron is given so that the magnetic field is totally concentrated on it. By the means of an external agent a conductor coil of n turns rotates between the magnetic poles. An External circuit is connected to the end of the coils by the means of carbon brushes and slip rings.
It contains,
 The magnetic poles help the dynamo to move in a certain direction.
The wire loop is actually a copper wounded coil which acts as a conductor to produce current it revolves in between the magnetic poles,
Slip rings are given so that continuous flow of current can be maintained.
The carbon brushes are given so that flashing or spark can be avoided.

The graph above represents the current in the circuit with respect to time.
Note: Magnitude of induced emf through a coil is given by Faraday's law of electromagnetic induction.  With the help of external means the coil is rotated. The angle between the magnetic field and the coil changes simultaneously as the coil rotates, which leads to the generation of an (alternating) induced