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Q.

u^1 and u^2 are two unit vectors such that |u^1×u^2|=3|u^1.u^2|. Then |u^1+u^2| is

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a

2

b

2+3

c

3

d

1

answer is C.

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Detailed Solution

|u^1×u^2|=3|u^1.u^2|⇒1.1sin⁡θ=3.1.1.cos⁡θ∴ θ=60o=Angle between u^1 and u^2∴ |u^1+u^2|=12+12+2.1.1.cos⁡60o=3
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