Question

Question 29:
If two vectors are
perpendicular then which of
the following is true?
a.
a. b = 0
b.
| a + b ] = | a-b
C. The angle between
vectors is 90°
d.
All of the above
Choose correct option​

Answer 1

Answer:

b=0

Explanation:

Vector  a  is perpendicular to vector  b  if their dot product,  a⋅b  is  0 .

This is because  a⋅b  is defined as  |a||b|cos(θ)  where  θ  is the angle between  a  and  b .

That is, it is the product of their magnitudes and the cosine of the angle between them. Of course, if the angle is  90∘ , then  cos(90∘)=0  and so  a⋅b  will  be 0

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