Question

If `hati, hatj, hatk` are unit vectors along three mutually perpendicular directions, then

Options

• `hati * hatj = 1`

• `hati xx hatj = 1`

• `hati * hatk = 0`

• `hati xx hatk = 0`

Answer 1

`bb(hati * hatj = 1)`

Explanation:

`hati.hatk = |hati| |hatk| cos  π/2`

= 1 × 1 × 0

= 0