A proton moves in the \( +z \) direction after being accelerated from rest through a potential d...

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A proton moves in the \( +z \) direction after being accelerated from rest through a potential difference \( V \). The proton then passes through a region with a uniform electric field \( E \) in the \( +x \) direction and a uniform magnetic field \( B \) in the \( +y \) direction, but the proton's trajectory is not affected. If the experiment were repeated using a potential difference of \( 2 \mathrm{~V} \), the proton would then be
(A) Deflected in the \( +x \) direction
(B) Deflected in the \( -x \) direction
(C) Deflected in the \( +v \) direction
(D) Deflected in the \( -y \) direction
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