If a, b, c, d are any four vectors then ( a b) ( c d) is a vector

JEE Advanced Mathematics question

If are any four vectors then is a vector

(A)perpendicular to
(B)along the line of intersection of two planes, one containing and the other containing Correct
(C)equally inclined to both and Correct
(D)none of these

Answer: (B),(C)

*(Figure: plane of with normal ; plane of with normal ; the two planes meet in a line .)*

Let . It is perpendicular to both normals and , so it lies

Create a free account to read the complete working (5 steps), and practise questions like this in a timed test.

Question ID VK-109715