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Date Posted: 00:28:48 07/30/01 Mon
Author: ¤³Ä£ªì¦Ñ®v
Author Host/IP: imsbbcf03a.netvigator.com / 203.198.2.3
Subject: Re: flame probe
In reply to: Kim 's message, "flame probe" on 05:44:30 05/30/01 Wed

>how can we use flame probe to measure potential?why?

1. When the needle is inserted into a point in the field with a positive potential say, negative charges will be induced in the needle, which is readily neutralized by the positive ions in the flame, meanwhile positive charges are accumulated on the leaf of the electroscope.
2. The electroscope is at the same potential as the probe (i.e. the potential at the position of the probe) since they are connected
3. The needle will always become neutral, and does not affect the original field and potential

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