The force `vecF` experienced by a particle of charge q moving with a velocity `vecv` in a magnetic field `vecB` is given by `vecF=q(vecvxxvecB)`. Which pairs of vectors are at right angles to each other?

Explanation

Vector `vec F ` is perpendicular to `vec v` as well as `vec B` . So, `vec F, vec v" and " vec F , vec B` are always perpendicular.