Physics · 2022
JEE Main · 28 July 2022, Shift 1 · Q51
If the projection of 2 i +4 j -2 k on i +2 j +α k is zero. Then, the value of α will be \ \ \ \.
If the projection of $\displaystyle 2 \hat{i}+4 \hat{j}-2 \hat{k}$ on $\displaystyle \hat{i}+2 \hat{j}+\alpha \hat{k}$ is zero. Then, the value of $\displaystyle \alpha$ will be
\_\_\_\_.
Official answer
5
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JEE Main 2022 Physics question, with the answer from NTA’s final answer key. Where our answers come from.