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3-1.Vectors
easy
यदि $\mathop P\limits^ \to .\mathop Q\limits^ \to = PQ,$ तो $\mathop P\limits^ \to $ तथा $\mathop Q\limits^ \to $ के बीच कोण ....... $^o$ है
A
$0$
B
$30$
C
$45$
D
$60$
(AIIMS-1999)
Solution
(a) $\cos \theta = \frac{{\mathop P\limits^ \to .\mathop Q\limits^ \to }}{{PQ}} = 1$
$⇒$ $\theta = 0^\circ $
Standard 11
Physics