Question

# In the angle subtended by vector ˆi+ˆj with the x - axis is

A
B
C
D

Solution

## The correct option is B If ¯a=^i+^j;¯b=^i (x-axis) then the angle between ¯a & ¯b is cos θ=¯a.¯b|¯a| |¯b|=(^i+^j).(^i)√12+12×√12=1√2 ⇒θ=45o

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