If λ(3i+2j-6k) is a unit vector, then the values of λ are?
±17
±7
±43
±143
Explanation for the correct answer.
As λ(3i+2j-6k) is a unit vector, so
λ=13i+2j-6k=132+22+-62=149=±17
Hence, option A is correct.
Ifis a nonzero vector of magnitude ‘a’ and λ a nonzero scalar, then λis unit vector if
(A) λ = 1 (B) λ = –1 (C)
(D)