# Find the value of $\rm \hat{i} \times \hat{i} = \hat j \times \hat j = \hat k \times \hat k$

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Find the value of $\rm \hat{i} \times \hat{i} = \hat j \times \hat j = \hat k \times \hat k$

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Correct Answer - Option 1 : 0

Concept:

Dot product of two vectors is defined as:

${\rm{\vec A}}{\rm{.\vec B = }}\left| {\rm{A}} \right|{\rm{ \times }}\left| {\rm{B}} \right|{\rm{ \times cos}}\;{\rm{\theta }}$

Cross/Vector product of two vectors is defined as:

${\rm{\vec A \times \vec B = }}\left| {\rm{A}} \right|{\rm{ \times }}\left| {\rm{B}} \right|{\rm{ \times sin}}\;{\rm{\theta }} \times \rm \hat{n}$

where θ is the angle between ${\rm{\vec A}}\;{\rm{and}}\;{\rm{\vec B}}$

Calculation:

To Find: Value of $\rm \hat{i} \times \hat{i}$

Here angle between them is 0°

${\rm{\hat i \times \hat i = }}\left| {\rm{i}} \right|{\rm{ \times }}\left| {\rm{i}} \right|{\rm{ \times sin}}\;{\rm{0 }} \times \rm \hat{n}=0$

Similarly $\rm \hat j \times \hat j = \hat k \times \hat k = 0$