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3. The disk of radius R meters carries a charge with the electrostatic
poten tial V volts. A particle of charge q coulombs lies on the axis of
the disk at a distance y meters from the disk. It can be shown that
the repulsive force F (in newtons) acting on the particle is
m, q O
Vq
y
F =
1 -
R
R² + y²
If a particle starts from the center of the plate with zero velocity,
determine its speed at y = R. Neglect the effect of gravity.

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