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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