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I built an electroscope, and I noticed that some charged objects didn't have enough charge to show any interaction.

So i was wondering if there is a threshold minimum charge for the electroscope to show any results.

It is made of iron wire in a form if spiral with 5 cm diameter.

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I would say it depends upon a million different things--the size, the metal used, the dimensions of the disc/rot/etc, the thickness and elasticity of the foil. This may give a wide range of answers, even if you consider order of magnitude. If you provided the exact dimensions and materials of your electroscope, it may be easier to answer. Not too sure, though. – Manishearth♦ Nov 23 '12 at 16:50

closed as not a real question by Manishearth♦ Dec 11 '12 at 9:01

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.