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3-1.Vectors
easy
$|2\hat i\,\, - \,\,\hat j\,\, - \,\,5\hat k|\,\,$ સદીશનું મૂલ્ય ..... થાય
A
$\sqrt {30} $
B
$\sqrt {38} $
C
$\sqrt {42} $
D
$\sqrt {35} $
Solution
$|2\hat i\,\, – \,\,\hat j\,\, – \,\,5\hat k|\,\,\, = \,\,\sqrt {{2^2}\,\, + \;\,{{\left( { – 1} \right)}^2}\,\, + \;\,{{\left( { – 5} \right)}^2}} \,\, = \,\,\sqrt {30} $
Standard 11
Physics
