d
\(\mathop A\limits^ \to  \) નો \(\mathop B\limits^ \to  \) સાથેનો ઘટક

\(\, = \,\,\left( {\frac{{\,\mathop A\limits^ \to  .\,\mathop B\limits^ \to  \,}}{B}} \right)\,\hat B\,\, = \,\,\left( {\frac{{\,\mathop A\limits^ \to  .\,\mathop B\limits^ \to  }}{B}} \right)\,\frac{{\mathop B\limits^ \to  }}{B}\,\)

\(\, = \,\,\left[ {\frac{{\left( {3\hat i\,\, + \;\,\hat j} \right)\,\,\left( {\hat j\,\, + \;\,2\hat k} \right)}}{{\sqrt 5 }}} \right]\,\,\frac{{\left( {\hat j\,\, + \;\,2\hat k} \right)}}{{\sqrt 5 }}\)

\( = \,\,\frac{1}{5}\,\,\left( {\hat j\,\, + \;\,2\hat k} \right)\)