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A proton is moving with an initial velocity of 6.28 x 10^5 m/s straight towards a large conducting sphere of radius 85.2 cm. The sphere has a charge of 4.83uC on it. Protons have a mass of 1.69 x 10^-27 kg.

a) Determine how close the proton can come to the surface of the sphere.

b) What is the voltage on the surface of the sphere?

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