#### Let If is a unit vector such that and then   is equal to Option 1) 1 Option 2) 2 Option 3) 3 Option 4) 0

As we learnt in

Vector Product of two vectors(cross product) -

If  and  are two vectors and  is the angle between them , then

- wherein

is unit vector perpendicular to both

Scalar Product of two vectors (dot product) -

- wherein

is the angle between the vectors

Since  is perpendicular to

Unit vector of

Now,

Option 1)

1

This option is incorrect.

Option 2)

2

This option is incorrect.

Option 3)

3

This option is correct.

Option 4)

0

This option is incorrect.