১.
$(\hat{\mathbf{i}} \times \hat{\mathbf{j}}) \cdot(\hat{\mathbf{i}}+\hat{\mathbf{j}})=?$
-
0
-
$\overrightarrow\{0\}$
-
$\hat{\mathrm{k}}$
-
$\hat{\mathrm{j}}$
ব্যাখ্যা
$(\hat{\mathrm{i}} \times \hat{\mathrm{j}}) \cdot(\hat{\mathrm{i}}+\hat{\mathrm{j}})=\hat{\mathrm{k}} \cdot(\hat{\mathrm{i}}+\hat{\mathrm{j}})=\hat{\mathrm{k}} \cdot \hat{\mathrm{i}}+\hat{\mathrm{k}} \cdot \hat{\mathrm{j}}=0+0=0$