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Let $\vec{A}=\hat{i} A \cos \theta+\hat{j} A \sin \theta$ be any vector. Another vector $\vec{B}$ which is normal to $A$ is

• A
  $\hat{i} B \cos \theta+j B \sin \theta$
• B
  $\hat{i} B \sin \theta+j B \cos \theta$
• ✓
  $\hat{i} B \sin \theta-j B \cos \theta$
• D
  $\hat{i} B \cos \theta-j B \sin \theta$