$0.4\hat i + 0.8\hat j + c\hat k$ represents a unit vector when $c$ is
$0.4\hat i + 0.8\hat j + c\hat k$ represents a unit vector when $c$ is
- A
$-0.2$
- B
$\sqrt {0.2} $
- C
$\sqrt {0.8} $
- D
$0$
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