00:02
Two wires.
00:03
We have two wires, let us say these are the two wires and both of them contain current.
00:09
The current in this left side wire is 3 ampere and the current in the right side wire is 6 ampere and they are both flowing in the same direction and both of these wires are separated at a distance of 10 centimeter.
00:22
Now we have to find the direction and magnitude of magnetic field at a point a which is at the midway which is 5 centimeter away from both these wires.
00:34
Now we know that magnetic field due to an infinitely long wire it is given by mu0 i by 2 pi r.
00:43
This is the formula for magnetic field due to infinitely long wire and we can also apply the direction in which that magnetic field is flowing.
00:51
So if we calculate for the first wire which is first wire which contains i1 current.
00:58
Magnetic field will be b1 and this will be i1.
01:03
And now we know that since we can find the direction of current sorry direction of magnetic field by the use of right hand thumb rule.
01:12
If we place our thumb in direction in which the current is flowing and curl our finger then we will see that due to wire 1 the magnetic field at point a is going inside the plane.
01:25
Similarly magnetic field due to wire 2 will be given as mu0 i2 by 2 pi r and if we calculate direction we can see that from the right hand thumb rule the magnetic field at point a will be coming out of the plane...