Question

The resultant of two vectors of magnitudes 3 units and 4 units is 1 unit. What is the magnitude of their cross product?

• A. 12 units
• B. 7 units
• C. 1 units
• D. zero

Answer 1

The correct option is D zero

The magnitude of $\overrightarrow{A}\times \overrightarrow{B}=AB\sin \theta =3\times 4\times \sin {180}^{\circ }=0.$
Hence the correct choice is (d)