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A charged particle is at a distance \( d\) from an infinite conducting plane maintained at zero potential. When released from rest, the particle reaches a speed \( u\) at a distance \( d/2\) from the plane. At what distance from the plane will the particle reach the speed \( 2u\)?
(a) \( d/6 \)(b) \( d/3 \) (c) \( d/4 \)(d) \( d/5 \)
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