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AP EAMCET Engineering 2018 Apr 23 Shift 2 Paper
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© examsnet.com
Question : 29
Total: 160
If
→
a
and
→
b
are unit vectors such that
→
a
+
→
b
is also a unit vector,then
|
→
a
−
→
b
|
2
=
1
2
3
0
Validate
Solution:
If the resultant of two vectors is unit vector then angle between them is
2
π
3
, so,
|
a
−
b
|
2
=
|
a
|
2
+
|
b
|
2
−
2
|
a
|
|
b
|
cos
2
π
3
=
1
+
1
−
2
(
1
)
(
1
)
(
−
1
2
)
=
2
+
1
=
3
© examsnet.com
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