1.

If a and b are two unit vectors inclined to X-axis at angles 30^(@) and 120^(@), then |a+b| is equal to

Answer»

`SQRT((2)/(3))`
`sqrt2`
`SQRT3`
2

Solution :Clearly, angle between a and `b=pi/2`
`implies a.b=0`
`:. |a+b|^(2)=a^(2)+b^(2)+2a.b=1+1+0=2`
`implies |a+b|=sqrt(2)`


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