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Consider a uniform electric field \( E=3 \times 10^{3} \hat{\mathrm{i}} \mathrm{N} / \mathrm{C} \). What is the flux of this field through a square of \( 10 \mathrm{~cm} \) on a side whose plane is parallel to the \( y z \) plane?
(A) \( 30 \mathrm{~N} \cdot \mathrm{m}^{2} / \mathrm{C} \)
(B) \( 40 \mathrm{~N} \cdot \mathrm{m}^{2} / \mathrm{C} \)
(C) \( 50 \mathrm{~N} \cdot \mathrm{m}^{2} / \mathrm{C} \)
(D) \( 60 \mathrm{~N} \cdot \mathrm{m}^{2} / \mathrm{C} \)
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