A conducting rod \( A C \) of length \( 4 l \) is rotated about a point \( O \) in a uniform mag...

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A conducting rod \( A C \) of length \( 4 l \) is rotated about a point \( O \) in a uniform magnetic field \( \vec{B} \) directed into the paper. \( A O=l \) and \( O C=3 l \). Then
(a) \( V_{A}-V_{O}=\frac{B \omega l^{2}}{2} \)
(b) \( V_{A}-V_{\mathrm{C}}=\frac{9}{2} B \omega l^{2} \)
(c) \( V_{A}-V_{C}=4 B \omega l^{2} \)
(d) \( V_{C}-V_{O}=\frac{9}{2} B \omega l^{2} \)
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