If \( C \) is perpendicular to \( r=x \hat{i}+y \hat{j} \). The possible values of \( C \) are (...

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If \( C \) is perpendicular to \( r=x \hat{i}+y \hat{j} \). The possible values of \( C \) are
(1) \( x \hat{i}-y \hat{j} \)
(2) \( y \hat{i}-x \hat{j} \)
(3) \( +x \hat{j}-y \hat{i} \)
(4) \( \hat{k} \)
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