Unit Vector Definition
Which of the following expressions correctly defines the unit vector r̂ in the direction of the vector r⃗?
A
r̂ = r⃗ / |r⃗|
B
r̂ = r⃗ × |r⃗|
C
r̂ = |r⃗| / r⃗
D
r̂ = |r⃗| × r⃗
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