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Q.

Which of the following expressions has magnitude unity .

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a

a→-b→a→-b→

b

a^+b^ when angle between a^ and b^ is 120°

c

a^-b^ when angle between  a^ and b^ is 60°

d

a→+b→a→+b→

answer is A, B, C, D.

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Detailed Solution

Vector upon the magnitude of vector is unit vector. If two vector each of magnitude one at 120° then their resultant has magnitude one

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