Question

magnitude of a vector is. (A) always positive. (B) always negative. (C) maybe positive. (D) maybe negative​

Answer 1

The magnitude of a vector is the length of the vector. The magnitude of the vector a is denoted as ∥a∥. See the introduction to vectors for more about the magnitude of a vector. Formulas for the magnitude of vectors in two and three dimensions in terms of their coordinates are derived in this page.