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3-1.Vectors
normal

જો  $\mathop {\rm{P}}\limits^ \to  .\mathop Q\limits^ \to  \,\, = \,\,PQ$ તો $\mathop {\rm{P}}\limits^ \to  \,$ અને $\mathop {\rm{Q}}\limits^ \to  \,$ વચ્ચેનો ખૂણો  ............. $^o$ હોય .

A

$0$

B

$30$

C

$45$

D

$60$

Solution

$\cos \theta \, = \,\,\frac{{\mathop {\rm{P}}\limits^ \to  .\mathop Q\limits^ \to  }}{{PQ}}\,\, = \,\,1\,$

$\therefore \,\,\theta \,\, = \,\,0^\circ $

Standard 11
Physics

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