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The top half of the ring with radius R is "+ Q", the bottom half is...

The top half of the ring with radius R is "+ Q", the bottom half is "-Q". On its axis, the charged particle "Q", 10R from the center, has the speed "Vo". What will be its speed when the particle comes to 3R?
Q=5,0 C
R=6,0 cm
k=9×10^9 N×m^2/C^2
q=2,0 C
m= 2,0×10^16 kg
V0= 5,0×10^4 m/s

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