1.

If a unit vector is represented by \[0.5\hat{i}+0.8\hat{j}+c\hat{k}\], then the value of ?c? is           [CBSE PMT 1999; EAMCET 1994]

A.            1    
B.            \[\sqrt{0.11}\]
C.            \[\sqrt{0.01}\]                     
D.            \[\sqrt{0.39}\]
Answer» C.            \[\sqrt{0.01}\]                     


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