00:01
Hi, in this question we have two vectors.
00:04
So vector a is given as 3 i cap minus 7 j cap and vector b is given as 2i cap plus 3j cap minus 2 k cap.
00:21
So these two vectors define a plane and it is the plane of the triangle with both tails at one vertex and each.
00:31
Head at one of the other vertices.
00:34
So we have to tell that which of the following vectors is perpendicular to the plane.
00:41
So here, according to the question, if this is vector a, then we have vector b like this and they are part of this triangle.
00:58
Now we have to find the vector that is perpendicular to a and b.
01:05
So, the vector that is perpendicular to a and b can be calculated by taking their cross product.
01:11
So, a vector, cross b vector.
01:15
So this will be equals to, so we'll take i -cap, j -cap and k -cap.
01:22
So for a vector, we have i -cap as 3, j -minus 7 and there is no k -cap, so this will be 0...