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A CD disk of radius (R = 1 cm) is sprayed witha charged paint so that the charge variescontinually with radial
distance r from thecenter in the following manner:σ = -(-3C/m)r/R.
1a Find the potential at a point 2 cm above the center.
Please give your answer in SI units and multiply by 10
Answer
-2.6
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1b Find the strength of the electric field at this location.
Please write your answer in SI units and times your answer by 10 13
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