a
ટોર્ક\(   = \,\,\mathop r\limits^ \to  \,\, \times \,\,\mathop F\limits^ \to  \,\,\,\, = \,\,\left| {\,\begin{array}{*{20}{c}}
  {\hat i}&{\hat j}&{\hat k} \\ 
  2&{ - 6}&{ - 12} \\ 
  p&3&6 
\end{array}\,} \right| \)

\(   = \,\,\hat i\,\,( - 36\,\, + \,\,36)\,\, - \,\,\hat j\,(12\,\, + \,\,12p)\,\, + \,\,\hat k\,\,(6\,\, + \,\,6p)\,\, \)

\( = \,\, - \hat j\,\,(12\,\, + \,\,12p)\,\, + \,\,\hat k\,\,(6\,\, + \,\,6p)\)

અહીં, કોણીય વેગમાનનું સંરક્ષણ થાય છે.
એટલે કે કણ પર લાગતું કુલ ટાર્ક શૂન્ય હોવું જાઈએ.

 \((0\,,\,\,0\,,\,\,0)\,\, = \,\, - \hat j\,\,(12\,\, + \,\,12p)\,\, + \,\,\hat k\,\,(6\,\, + \,\,6p)\)

\(\,\therefore \,\,12\,\, + \,\,12p\,\, = \,\,0\,\,\,\)

\(\Rightarrow \,\,\,p\,\, = \,\, - 1\)