Unit Vector Dot Product Calculation (Jee Mains) | ExamDuo
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Vector Algebra and Components
Medium
Unit Vector Dot Product Calculation
Let
→
a
=
^
i
+
2
^
j
+
3
^
k
,
→
b
=
2
^
i
+
3
^
j
−
5
^
k
and
→
c
=
3
^
i
−
^
j
+
λ
^
k
be three vectors. Let
→
r
be a unit vector along
→
b
+
→
c
. If
→
r
.
→
a
=
3
, then
3
λ
is equal to :
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SELECT ONE OPTION
A
27
B
25
C
25
D
21
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