A disk has a positive charge distributed uniformly across its surface. While ans

Question

A disk has a positive charge distributed uniformly across its surface.

While answering the questions below, consider the concepts of force, field, potential energy, and potential. In (a) say or show something involving two of these; in (b) and (c) address all four.

(a) How does the presence of the disk affect the space at some point along its axis?

(b) If a proton were placed at this point and release from rest, how would it respond to the effect? and why?

(c) If an electron were instead released from rest at this point, what would it do and why?

Explanation / Answer

a) There would be electric field at the axis direted away from the disk

b) if a proton is placed in the axis it would move away from the disk along the axis . It would be repeled by the positive charge of the disk

c electron would move twards the disk because it would be attracted by the positive charge of the disk

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