The condition that they are perpendicular to each other if $\overrightarrow{\mathrm{A}}={\mathrm{a}}_1\hat{\mathrm{i}}+{\mathrm{b}}_1\hat{\mathrm{j}} \mathrm{and} \overrightarrow{\mathrm{B}}={\mathrm{a}}_2\hat{\mathrm{i}}+{\mathrm{b}}_2\hat{\mathrm{j}}$ is

• A

  $\frac{{\mathrm{a}}_1}{{\mathrm{b}}_1}=-\frac{{\mathrm{b}}_2}{{\mathrm{a}}_2}$

• B

  ${\mathrm{a}}_1{\mathrm{b}}_1={\mathrm{a}}_2{\mathrm{b}}_2$

• C

  $\frac{{\mathrm{a}}_1}{{\mathrm{a}}_2}=-\frac{{\mathrm{b}}_1}{{\mathrm{b}}_2}$

• D

  $\mathrm{None} \mathrm{of} \mathrm{these}$