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Potential question (electric fields a level) multi choice

Hi,
could someone please help me with this? I'm really confused and need to be pointed in the right direction. I understand that this is really last minute before the paper, sorry.
Screenshot 2024-06-05 190706.png
(edited 6 months ago)
Reply 1
i hate these type of questions
force up = force down, because the particle is stationary
up = electrostatic force, = Eq and E = V/d for a uniform field.
down = mg.

Hence, mg = Vq/d

Rearrange for V,

Answer is B

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