Q. 26

(a) Describe, wit

Answer :

(a) The following diagram illustrates emf being induced in a coil due to a moving magnet. Moving a magnet changes the magnetic flux through the loop. Changing flux induces magnetic field.


When the south pole of the magnet moves towards the coil, a south pole in induced by the current flowing in the loop. Similarly, when the magnet moves away from the coil, a north pole is induced in the loop.



The emf () induced in the coil is related to theS magnetic flux() as:



(b) We know that the emf () induced in the coil is related to the magnetic flux() as:



Here, magnetic flux is



Where x in the length of the wire and y is the breadth.


As the coil is moved out, the length changes according the velocity as




(i)Now, velocity of both loops is same but the breadth y of square loop is more than that of rectangular loop. Hence, the emf induced will be more in square loop.


(ii) As rectangular loop has higher resistance (more wire length) than the square loop, the current would be less in the rectangular loop.


However, as the field is constant and the loops are moving within the field region, there will be no emf induced in either loops.


OR


(a) AC generator is a device which converts mechanical energy into electrical energy in form of alternating current(AC). AC generator works on the principle of electromagnetic induction. As the coil, placed in between the two poles of the magnet, rotates, the changing area induces a current in the coil.


(b) The following diagram illustrates an AC generator.



Here, the coil is mechanically rotated at angular velocity . The angle between the area vector A and the magnetic field B changes as



Now, the magnetic flux is given by



Therefore, the induced emf for a coil of N turns is




(c) The following diagram shows the induced emf as time propagates.



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