A) \[A.B=3\]
B) \[A.B=4\]
C) \[A.B=-4\]
D) \[A.B=-3\]
Correct Answer: D
Solution :
Given,\[A=2\hat{i}+2\hat{j}-\hat{k}\]and\[B=-\hat{j}+\hat{k}\] Scalar product \[A.B=(2\hat{i}+2j-\hat{k}).(-\hat{j}+\hat{k})\] Using\[\hat{i}.\hat{i}=1,\hat{j}.\hat{j}=1,\hat{k}.\hat{k}=1\]we have \[A.B=-2-1=-3\]You need to login to perform this action.
You will be redirected in
3 sec