A vector has magnitude

MATHEMATICS · Single correct · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

A vector

\vec{u}=3\mathbf{i}+4\mathbf{j}+z\mathbf{k}

has magnitude

13

. If

z

is positive, find

z

. (a) 8 (b) 6 (c) 12 (d) 13