**Question :** If 0.5î+ 0.8ĵ+ ck̂ is a unit vector, then the value of 𝑐 is

(A) \sqrt{0.11}

(B) \sqrt{0.22}

(C) \sqrt{0.33}

(D) \sqrt{0.89}

**Answer :** option (A)

**Solution :**

with
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**Question :** If 0.5î+ 0.8ĵ+ ck̂ is a unit vector, then the value of 𝑐 is

(A) \sqrt{0.11}

(B) \sqrt{0.22}

(C) \sqrt{0.33}

(D) \sqrt{0.89}

**Answer :** option (A)

**Solution :**