Gujarati
3-1.Vectors
easy

सदिश $\mathop A\limits^ \to = 5\hat i - 12\hat j,$ की दिशा में इकाई सदिश होगा

A

$\hat i$

B

$\hat j$

C

$(\hat i + \hat j)/13$

D

$(5\hat i - 12\hat j)/13$

Solution

(d) $\mathop A\limits^ \to = 5\hat i + 12\hat j$,$|\mathop A\limits^ \to | = \sqrt {{5^2} + {{( – 12)}^2}} $=$\sqrt {25 + 144} $$ = 13$

इकाई सदिश $\hat A = \frac{{\mathop A\limits^ \to }}{{|\overrightarrow A |}}$=$\frac{{5\hat i – 12\hat j}}{{13}}$

Standard 11
Physics

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