00:01
In this question, a long straight wire carries 2 .5 amp current along the x -axis.
00:04
So where is the x -axis? around the positive x -axis, minus.
00:09
And over here, we have 2 .5 ampere.
00:13
And this is a long wire.
00:14
So what is a migrant direction at a point 15 centimeter towards the positive y -axis? so this is 15 centimeters.
00:20
I'm going to write it as 0 .15 meter.
00:21
I hope you understand because centimeter should be converted into meters, right, by dividing by 100.
00:26
This is point a.
00:27
And opposite side as well, towards the minus y -x.
00:30
On the same distance at point b.
00:34
So definitely we ought to use the right hand, right hand, right hand curl rule in the part a.
00:41
First of all, the magnitude is going to be mu not i by 2 pi r for both the cases because the distance is same...