Q.

If the sum of two unit vectors is a unit vector, then magnitude of difference in two unit vectors is

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a

2

b

3

c

1/2

d

5

answer is B.

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Detailed Solution

Sum of two unit vectors is a unit vector, means angle between those two unit vectors is 1200∴   Difference,   |S|=1+1-2×1×1×cos120°=3
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