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Question

The angle which a vector ^i^j+2^k makes with y - axis is

A
60
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B
120
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C
150
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D
tan1(12)
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Solution

The correct option is B 120
Assume that the angle made by vector with y-axis is β,
cosβ=AyA=1(1)2+(1)2+(2)2
cosβ=12
β=120

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