Let a→ and b→ be two non-zero perpendicular vectors. A vector r→ satisfying the equation r→×b→=a→ can be
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a
b→−a→×b→|b→|2
b
2b→−a→×b→|b→|2
c
|a→|b→−a→×b→|b→|2
d
|b→|b→−a→×b→|b→|2
answer is A.
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Detailed Solution
Since a→,b→ and a→×b→ are non-coplanar, r→=xa→+yb→+z(a→×b→)∴ r→×b→=a→⇒ xa→×b→+z{(a→⋅b→)b→−(b→⋅b→)a→}=a→ or −1+z|b→|2a→+xa→×b→=0 (since a→⋅b→=0 ) ∴ x=0 and z=−1|b→|2 Thus, r→=yb→−a→×b→|b→|2, where y is the parameter.