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3-1.Vectors
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જો $ 0.5\hat i + 0.8\hat j + c\hat k $ એકમ સદિશ હોય, તો $c$ નું મૂલ્ય કેટલું હશે?
A
$ 1 $
B
$ \sqrt {0.11} $
C
$ \sqrt {0.01} $
D
$ \sqrt {0.39} $
(AIPMT-1999)
Solution
(b) Magnitude of unit vector $= 1$
$⇒$ $\sqrt {{{(0.5)}^2} + {{(0.8)}^2} + {c^2}} = 1$
By solving we get $c = \sqrt {0.11} $
Standard 11
Physics
