Question

The total electric field at a point on the axis of a uniformly charged disk, which has a radius R and a uniform charge density of σ, is given by the following expression, where x is the distance of the point from the disk. (R2 + x2)1/2 Consider a disk of radius R-3.18 cm having a uniformly distributed charge of +4.83 C. (a) Using the expression above, compute the electric field at a point on the axis and 3.12 mm from the center. N/C (b) Explain how the answer to part (a) compares with the field computed from the near-field approximation E σ/260 This answer has not been graded yet. (c) Using the first expression above, compute the electric field at a point on the axis and 31.2 cm from the center of the disk. N/C (d) Explain how the answer to part (c) compares with the electric field obtained by treating the disk as a +4.83-HC charged particle at a distance of 31.2 cm.

Answer 1

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