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Need solution for rd sharma maths class 12 chapter 24 vector or cross product Exercises Multiple choice questions question 10 maths textbook solution

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Answer: \hat{i}.\hat{i}=1 

Given: \hat{i},\hat{j},\hat{k} are unit vectors

Hint: Check all the options


  1. \hat{i}.\hat{j}=1 which is wrong \because \hat{i}.\hat{j}=0
  2. \hat{i}.\hat{i}=1which is true
  3. \hat{i}\times \hat{j}=1which is wrong \because \hat{i}\times \hat{j}=\hat{k}
  4. \hat{i}\times \left ( \hat{j}\times \hat{k} \right )=1which is wrong

                     \because \hat{i}\times \left ( \hat{-i} \right )=0


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