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Byju's Answer
Standard XII
Physics
Summary
Let p=2î+3ĵ+k...
Question
Let
→
p
=
2
^
i
+
3
^
j
+
^
k
and
→
q
=
^
i
+
2
^
j
+
^
k
be two vectors. If a vector
→
r
=
α
^
i
+
β
^
j
+
γ
^
k
is perpendicular to each of the vectors
(
→
p
+
→
q
)
and
(
→
p
−
→
q
)
,
and
∣
∣
→
r
∣
∣
=
√
3
,
then
|
α
|
+
|
β
|
+
|
γ
|
is equal to
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Solution
→
r
=
√
3
(
→
p
+
→
q
)
×
(
→
p
−
→
q
)
∣
∣
(
→
p
+
→
q
)
×
(
→
p
−
→
q
)
∣
∣
=
√
3
∣
∣ ∣
∣
i
j
k
3
5
2
1
1
0
∣
∣ ∣
∣
∣
∣
(
→
p
+
→
q
)
×
(
→
p
−
→
q
)
∣
∣
=
√
3
(
−
2
^
i
+
2
^
j
−
2
^
k
)
2
√
3
=
−
i
+
j
−
k
|
α
|
+
|
β
|
+
|
γ
|
=
3
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Similar questions
Q.
If
→
p
=
^
i
+
^
j
+
^
k
and
→
q
=
^
i
−
2
^
j
+
^
k
, find a vector of magnitude
5
√
3
units perpendicular to the vector
→
q
and coplanar with vectors
→
p
and
→
q
.
Q.
If
^
i
+
p
^
j
+
^
k
,
2
^
i
+
3
^
j
+
q
^
k
are parallel vectors then
(
p
,
q
)
=
?
Q.
Let
P
,
Q
,
R
be points with position vectors
→
r
1
=
3
^
i
−
2
^
j
−
^
k
,
→
r
2
=
^
i
+
3
^
j
+
4
^
k
and
→
r
3
=
2
^
i
+
^
j
−
2
^
k
relative to an origin
O
. The distance of
P
from the plane
O
Q
R
is
Q.
Let
P
be a plane passing through the points
(
1
,
0
,
1
)
,
(
1
,
−
2
,
1
)
and
(
0
,
1
,
−
2
)
.
Let a vector
→
a
=
α
^
i
+
β
^
j
+
γ
^
k
be such that
→
a
is parallel to the plane
P
, perpendicular to
(
^
i
+
2
^
j
+
3
^
k
)
and
→
a
⋅
(
^
i
+
^
j
+
2
^
k
)
=
2.
Then
(
α
−
β
+
γ
)
2
equals
Q.
If the vectors
α
^
i
+
^
j
+
^
k
,
^
i
+
β
^
j
+
^
k
,
^
i
+
^
j
+
λ
^
k
(
α
,
β
,
γ
≠
1
)
are coplanar, then the value of
1
1
−
α
+
1
1
+
β
+
1
1
−
γ
is.
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