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CBSE Class 12 Math 2009 Solved Paper

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Question : 7
Total: 29
Write a unit vector in the direction of
→
b
 = 2
^
i
+
^
j
+2
^
k
Solution:  
→
b
 = 2
^
i
+
^
j
+2
^
k
Unit vector in the direction of b is given by
→
b
|
→
b
|
→
b
|
→
b
|
 =
2
^
i
+
^
j
+2
^
k
√9
=
1
3
(2
^
i
+
^
j
+2
^
k
)
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