00:01
In the given problem here this is a flexible circular loop of wire which is which has been converted into the form of this rectangular circuit also here this is the resistance of this circuit are there is a uniform magnetic field which is directed into the plane of paper as shown here in this figure.
00:46
The magnitude of magnetic field which is directed into the plane of paper is 0 .950 tesla diameter of this loop, flexible circular loop is 6 .5.
01:02
So, 5 .50 centimeters.
01:04
So, its radius r will be equal to half of the diameter, means 6 .50 by 2 centimeter, which will come out to be 3 .25 centimeter.
01:19
Now this loop, flexible loop, is stretched at the two edges as shown here in the figure, shown in the red.
01:29
And within our time duration of delta t is equal to 0 .250 seconds, this area is reduced to 0.
01:43
It is stretched and squeezed to 0.
01:47
So, a2, the final area will be 0, while initial area is is pi r square.
01:54
Now, in the first part of the problem, we have to find the average emf induced in this flexible loop as a result of the change of area.
02:07
That will be given by the negative of time rate of change of magnetic flux which is linked through the coil.
02:15
Or it can also be written as negative of final magnetic flux minus initial magnetic flux divided by the time, the time duration within which the area is reduced...