**Question :** For what value of , A= 2î+ aĵ+ k̂ will be perpendicular to B = 4î− 2ĵ− k̂

(A) 4

(B) 0

(C) 3

(D) 1

**Answer :** option (C)

**Solution :**

with
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**Question :** For what value of , A= 2î+ aĵ+ k̂ will be perpendicular to B = 4î− 2ĵ− k̂

(A) 4

(B) 0

(C) 3

(D) 1

**Answer :** option (C)

**Solution :**