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What will be the projection of vector

Question:

What will be the projection of vector $\overrightarrow{\mathrm{A}}=\hat{\mathrm{i}}+\hat{\mathrm{j}}+\hat{\mathrm{k}}$ on vector $\overrightarrow{\mathrm{B}}=\hat{\mathrm{i}}+\hat{\mathrm{j}}$ ?

  1. $\sqrt{2}(\hat{i}+\hat{j}+\hat{k})$

  2. $2(\hat{i}+\hat{j}+\hat{k})$

  3. $\sqrt{2}(\hat{i}+\hat{j})$

  4. $(\hat{i}+\hat{j})$

Correct Option: , 4

Solution:

$(A \cos \theta) \hat{B}=A\left(\frac{\vec{A} \cdot \vec{B}}{A B}\right) \hat{B}=\frac{\vec{A} \cdot \vec{B}}{B} \hat{B}$

$=\frac{2}{\sqrt{2}}\left(\frac{\hat{\mathrm{i}}+\hat{\mathrm{j}}}{\sqrt{2}}\right)=\hat{\mathrm{i}}+\hat{\mathrm{j}}$

 

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