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  • Need solution for RD sharma maths class 12 chapter 24 vector or cross product Exercise Multiple choice questions question 20 maths textbook solution

Need solution for RD sharma maths class 12 chapter 24 vector or cross product Exercise Multiple choice questions question 20 maths textbook solution

Answers (1)

Answer: \hat{i}.\hat{k}=0

Given: \hat{i},\hat{j},\hat{k}are unit vectors along three mutually perpendicular directions

Hint: Verify all the options

Explanation:

  1. \hat{i}.\hat{j}=1which is false

We know if \hat{i},\hat{j},\hat{k}  are unit vector then \hat{i}.\hat{j}=0

  1. \hat{i}\times \hat{j}=1  which is false        \because of  \hat{i}\times \hat{j}=\hat{k}
  2. \hat{i}.\hat{k}=0 which is true
  3. \hat{i}\times \hat{k}=0 which is false       \because of \hat{i}\times \hat{k}=-\hat{j}
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