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Question

If a×b=c, b×c=a and a,b,c be the moduli of the vectors a, b, c respectively, then


A

a=1 ,b=1

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B

c = 1, a = 1

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C

a.(b×c)=1

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D

b = 1, c = a

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Solution

The correct option is D

b = 1, c = a


Since a×b=c(b×c)×b=c(b.b)c(b.c)b=c(b.b)=1, b.c=0b2=1 i.e. b=1
Angle between b and c is 90
|b×c|=|b||c|=|c| (|b|=1)
|b×c|=|c|=|a| i.e. c=a.


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