A uniform electric field of 100 . \( \mathrm{Vm}^{-1} \) is directed at \( 60^{\circ} \) with th...

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A uniform electric field of 100 . \( \mathrm{Vm}^{-1} \) is directed at \( 60^{\circ} \) with the positive \( x \)-axis as shown in figure. If \( O A=2 \mathrm{~m} \), the potential difference \( V_{O}-V_{A} \) is
(1) \( -50 \mathrm{~V} \)
(2) \( 50 \mathrm{~V} \)
(3) \( 100 \mathrm{~V} \)
(4) \( -100 \mathrm{~V} \)
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