Question

8. If a = 2î +4ị and b = Kî - 6j are two vectors
which are perpendicular to each other, then value of
Kis
(a) 8
(c) 24
(6) 12
(d) -18​

Answer 1

Answer:

k = 12

Explanation:

a = 2î +4ị

b = Kî - 6j

As a & b are perpendicular so a.b = 0

(2î +4ị).(Kî - 6j) = 0

2k-24 = 0

2k = 24

k = 12