If the angle between the vectors and is

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

If the angle between the vectors

\mathbf{a}

and

\mathbf{b}

\theta

, the value of

(\mathbf{b}\times\mathbf{a})\cdot\mathbf{a}

is equal to: (1)

BA^2\cos\theta

(2)

BA^2\sin\theta

(3)

BA^2\sin\theta\cos\theta

(4) zero