Which of these source charges will produce a maximum possible speed?

  • Thread starter MyNewPony
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  • #1
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Homework Statement



Your lab assignment is to use positive charge Q to launch a proton, starting from rest, so that it acquires the maximum possible speed. You can launch the proton from the surface of a sphere of positive charge Q and radius R, or from the center of a ring of charge Q and radius R, or from the center of a disk of charge Q and radius R.

a) We will choose to launch the proton from the surface of a sphere of positive charge Q and radius R.

b) We will choose to launch the proton from the center of a ring of charge Q and radius R.

c) We will choose to launch the proton from the center of a disk of charge Q and radius R.


2. The attempt at a solution

I have no idea how to go about solving this. I'm assuming a) is the correct answer because it has the greatest surface area?
 

Answers and Replies

  • #2
tiny-tim
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Hi MyNewPony! :wink:

Find the potential energy in each case (calculated with energy at infinity = 0) :smile:
 

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