Find a unit vector perpendicular to both A⃗=î+ĵ and B⃗=î-ĵ+2k̂.

Question

G1 Physics · Accepted Answer

A×B=(2,−2,−2)=2(î−ĵ−k̂). Its unit direction is ±(î−ĵ−k̂)/√3; the listed positive cross-product direction is option A.