Question

If the angle between the vectors A and B is θ, the value of the product  vector (B x A). A is equal to

(a) BA² sinθ

(b) BA² cos θ

(c) BA² sinθcosθ

(d) zero

Answer 1

Correct option  (d) zero

Explanation:

Let vector A x B = C

The cross product of B and A is perpendicular to the plane containing ) A and B i.e. perpendicular to A . if a dot product of this cross product and A is taken, as the cross product is