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Byju's Answer
Standard XII
Physics
Comparing Vectors
If a , b , ...
Question
If
→
a
,
→
b
,
→
c
are non-coplanar vectors such that
→
b
×
→
c
=
→
a
,
→
a
×
→
b
=
→
c
and
→
c
×
→
a
=
→
b
, then
A
∣
∣
→
a
∣
∣
=
1
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B
∣
∣
∣
→
b
∣
∣
∣
=
1
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C
∣
∣
→
a
∣
∣
+
∣
∣
∣
→
b
∣
∣
∣
+
∣
∣
→
c
∣
∣
=
3
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D
∣
∣
∣
→
a
+
→
b
+
→
c
∣
∣
∣
=
√
3
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Solution
The correct options are
A
∣
∣
∣
→
b
∣
∣
∣
=
1
B
∣
∣
→
a
∣
∣
=
1
C
∣
∣
→
a
∣
∣
+
∣
∣
∣
→
b
∣
∣
∣
+
∣
∣
→
c
∣
∣
=
3
D
∣
∣
∣
→
a
+
→
b
+
→
c
∣
∣
∣
=
√
3
[
¯
a
¯
b
¯
c
]
=
¯
a
.
¯
a
=
|
¯
a
|
2
Similarly
[
¯
a
¯
b
¯
c
]
=
|
¯
b
|
2
=
|
¯
c
|
2
|
¯
a
|
2
=
|
¯
b
|
2
=
|
¯
c
|
2
=
[
a
b
c
]
Now
→
a
,
→
b
,
→
c
are mutually perpendicular.
|
→
b
×
→
c
|
=
|
→
b
|
|
→
c
|
|
→
b
|
|
→
c
|
=
|
→
a
|
|
→
a
|
=
|
→
b
|
=
|
→
c
|
Hence,
|
→
b
|
=
1
|
→
a
|
=
|
→
b
|
=
|
→
c
|
=
1
|
→
a
+
→
b
+
→
c
|
=
√
→
a
2
+
→
b
2
+
→
c
2
+
2.
→
a
.
→
b
+
2.
→
b
.
→
c
+
2.
→
c
.
→
a
=
√
1
2
+
1
2
+
1
2
+
0
=
√
3
|
→
a
|
+
|
→
b
|
+
|
→
c
|
=
3
Suggest Corrections
0
Similar questions
Q.
If
¯
¯
¯
a
,
¯
¯
b
,
¯
¯
c
are non-coplanar vectors such that
¯
¯
¯
a
×
¯
¯
b
=
¯
¯
c
,
¯
¯
b
×
¯
¯
c
=
¯
¯
¯
a
,
¯
¯
c
×
¯
¯
¯
a
=
¯
¯
b
, then
|
¯
¯
¯
a
|
+
2
|
¯
¯
b
|
−
3
|
¯
¯
c
|
is equal to
Q.
If
→
a
,
→
b
,
→
c
are non coplanar vectors such that
→
b
×
→
c
=
→
a
,
→
a
×
→
b
=
→
c
and
→
c
×
→
a
=
→
b
, then
Q.
lf
¯
¯
¯
a
,
¯
¯
b
,
¯
¯
¯
c
are three non-coplanar vectors such that
¯
¯
b
×
¯
¯
¯
c
=
¯
¯
¯
a
,
¯
¯
¯
c
×
¯
¯
¯
a
=
¯
¯
b
and
¯
¯
¯
a
×
¯
¯
b
=
¯
¯
¯
c
, then
|
¯
¯
¯
a
+
¯
¯
b
+
¯
¯
¯
c
|
=
Q.
If
a
,
b
,
c
are non-coplanar unit vectors such that
a
×
(
b
×
c
)
=
b
+
c
√
2
,
then the angle between
a
and
b
is
Q.
If
a
→
,
b
→
,
c
→
are non-coplanar vectors, then
b
→
×
c
→
,
a
→
+
b
→
+
c
→
a
→
b
→
c
→
= _______________.
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