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JEEMAIN and NEET
>>
NEET PAST PAPERS
>>
2015
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Q)
If vectors
→
A
=
cos
ω
ˆ
i
+
sin
ω
ˆ
j
and
→
B
=
cos
ω
t
2
ˆ
i
+
sin
ω
t
2
ˆ
j
are functions of time, then the value of
t
at which they are orthogonal to each other is :
( A )
t
=
π
4
ω
( B )
t
=
π
2
ω
( C )
t
=
0
( D )
t
=
π
ω
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