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Byju's Answer
Standard XII
Mathematics
Applications of Dot Product
If the vector...
Question
If the vectors
−
3
i
+
4
j
+
λ
k
and
μ
i
+
8
j
+
6
k
are collinear vectors, then find
λ
and
μ
.
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Solution
∣
∣ ∣ ∣
∣
ˆ
i
ˆ
j
ˆ
k
−
3
4
λ
μ
8
6
∣
∣ ∣ ∣
∣
=
0
ˆ
i
(
24
−
8
λ
)
−
ˆ
j
(
−
18
−
μ
λ
)
+
ˆ
k
(
−
24
−
4
μ
)
=
0
⇒
24
−
8
λ
=
0
∴
λ
=
3
⇒
4
μ
=
−
24
∴
μ
=
−
6
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0
Similar questions
Q.
Find the shortest distance between the following pairs of lines whose vector equations are:
(i)
r
→
=
3
i
^
+
8
j
^
+
3
k
^
+
λ
3
i
^
-
j
^
+
k
^
and
r
→
=
-
3
i
^
-
7
j
^
+
6
k
^
+
μ
-
3
i
^
+
2
j
^
+
4
k
^
(ii)
r
→
=
3
i
^
+
5
j
^
+
7
k
^
+
λ
i
^
-
2
j
^
+
7
k
^
and
r
→
=
-
i
^
-
j
^
-
k
^
+
μ
7
i
^
-
6
j
^
+
k
^
(iii)
r
→
=
i
^
+
2
j
^
+
3
k
^
+
λ
2
i
^
+
3
j
^
+
4
k
^
and
r
→
=
2
i
^
+
4
j
^
+
5
k
^
+
μ
3
i
^
+
4
j
^
+
5
k
^
(iv)
r
→
=
1
-
t
i
^
+
t
-
2
j
^
+
3
-
t
k
^
and
r
→
=
s
+
1
i
^
+
2
s
-
1
j
^
-
2
s
+
1
k
^
(v)
r
→
=
λ
-
1
i
^
+
λ
+
1
j
^
-
1
+
λ
k
^
and
r
→
=
1
-
μ
i
^
+
2
μ
-
1
j
^
+
μ
+
2
k
^
(vi)
r
→
=
2
i
^
-
j
^
-
k
^
+
λ
2
i
^
-
5
j
^
+
2
k
^
and
,
r
→
=
i
^
+
2
j
^
+
k
^
+
μ
i
^
-
j
^
+
k
^
(vii)
r
→
=
i
^
+
j
^
+
λ
2
i
^
-
j
^
+
k
^
and
,
r
→
=
2
i
^
+
j
^
-
k
^
+
μ
3
i
^
-
5
j
^
+
2
k
^
(viii)
r
→
=
8
+
3
λ
i
^
-
9
+
16
λ
j
^
+
10
+
7
λ
k
^
and
r
→
=
15
i
^
+
29
j
^
+
5
k
^
+
μ
3
i
^
+
8
j
^
-
5
k
^
[NCERT EXEMPLAR]
Q.
Find
λ
if the vectors
2
i
+
j
+
k
and
i
−
4
j
+
λ
k
are mutually perpendicular.
Q.
The value of λ for which the vectors
3
i
^
-
6
j
^
+
k
^
and
2
i
^
-
4
j
^
+
λ
k
^
are parallel is
(
a
)
2
3
(
b
)
3
2
(
c
)
5
2
(
d
)
2
5
Q.
Find the value of λ for which the four points with position vectors
-
j
^
-
k
^
,
4
i
^
+
5
j
^
+
λ
k
^
,
3
i
^
+
9
j
^
+
4
k
^
and
-
4
i
^
+
4
j
^
+
4
k
^
are coplanar.
Q.
If the vectors
2
i
+
λ
j
−
k
and
2
i
−
2
j
+
2
k
are perpendicular to each other then find
λ
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