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Question

Electrons are accelerated by voltage V0, initially electrons were at rest, speed after covering distance x is 
  1. vV0
  2. vx
  3. vx
  4. vV0


Solution

The correct option is D vV0
Potential energy of point charge = qV
(q - charge, V = potential)
qV+0=qV+12mv2
12mv2=q(VV)=qV0
vV0

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