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VITEEE 2018 Solved Paper
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© examsnet.com
Question : 119
Total: 125
If
→
a
=
(
^
i
+
^
j
+
^
k
)
,
→
a
.
→
b
= 1 and
→
a
×
→
b
=
^
j
−
^
k
, then
→
b
is
^
i
−
^
j
+
^
k
2
^
j
−
^
k
^
i
2
^
i
Validate
Solution:
Since
(
→
a
×
→
b
)
×
→
a
=
(
→
a
.
→
a
)
.
→
b
-
(
→
a
.
→
b
)
.
→
a
∴
(
^
j
−
^
k
)
×
(
^
i
+
^
j
+
^
k
)
=
(
√
3
)
2
(
→
b
)
-
(
^
i
+
^
j
+
^
k
)
⇒
3
→
b
=
3
^
i
⇒
→
b
=
^
i
© examsnet.com
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