00:01
As for the question, we have to find using the stock theorem, the line integral of y dx plus z dy minus 4x dz over the circle c with center 0, 0, 0, 1 and the radius 1 units and the plane x plus y plus z is equal to.
00:30
Clearly, as per the stock theorem, your p is divided by here y, q is divided by here z and r is divided by your minus 4x.
00:42
Let's quickly find the unit vector which is perpendicular to the plane x plus y plus z, which is simply n cap 1 dot i plus 1 dot j plus 1 dot k over square root of 1 square plus 1 square plus 1 square.
01:08
So n cap is finally 1 over root 3 i cap plus 1 over root 3 j cap plus 1 over root 3 k cap.
01:19
Let's find del cross f.
01:24
By the formula, it is partial derivative of r with respect to y minus partial derivative of q with respect to z i cap plus partial derivative of p with respect to z minus partial derivative of r with respect to x j cap plus partial derivative of q with respect to x minus partial derivative of r p this time with respect to y k cap.
01:54
Comparing the values, we get 0 minus 1 i cap or simply minus i cap, 0 minus minus 4 plus 4 j cap simply plus 4 k cap j cap and it is 0 minus 1 k cap.
02:08
So vector is finally minus i plus 4 j minus k...