18 If ar  is a nonzero vector of magnitude ‘a’ and λ a nonzero scalar, then λ ar  is unit
vector if
(A) λ = 1
(B) λ = – 1
(C) a = |λ|
(D) a = 1/|λ|
10 6 3  Vector (or cross) product of two vectors
In Section 10