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Byju's Answer
Standard IX
Mathematics
Applications of Dot Product
If r⃗·a⃗=r⃗·b...
Question
If
→
r
.
→
a
=
→
r
.
→
b
=
→
r
.
→
c
=
0
where
→
a
,
→
b
,
→
c
are non – coplanar, then
A
→
r
⊥
(
→
c
×
→
a
)
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B
→
r
⊥
(
→
a
×
→
a
)
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C
→
r
⊥
(
→
b
×
→
c
)
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D
→
r
=
→
0
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Solution
The correct option is
D
→
r
=
→
0
Let
→
r
≠
0
.Then
→
r
.
→
a
=
→
r
.
→
b
=
→
r
.
→
c
=
0
⇒
→
a
,
→
b
,
→
c
are coplanar, which is a contradiction.
Therefore,
→
r
=
→
0
Suggest Corrections
0
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