Question

Attempt any Eight from follow
2.3. If A= 2i-j+ k and B = i+ 2j – 6k are two vector, find A.B​

Answer 1

Answer:

Explanation:

Dot product obeys homogenity principal

IE you should multiply I cap with I cap only.

A.B is equal to vector A multiplyed by vector B with its component

(2i-1j+1k).(1i+2j-6k)

(2*1)+((-1)+2)+(1-6)

2+1-5

-2 units

Note rule of dot product is i.i=1