MixedHardQuestion 260018
Question
The vector perpendicular to both î + ĵ and ĵ + k̂ is:
- Aî − ĵ + k̂Correct
- Bî + ĵ + k̂
- Cî − k̂
- D2î − ĵ − k̂
Correct answer
î − ĵ + k̂
Explanation
Cross product (î+ĵ) × (ĵ+k̂) = |î ĵ k̂; 1 1 0; 0 1 1| = î(1−0) − ĵ(1−0) + k̂(1−0) = î − ĵ + k̂.