Phy 電問題

Wearing of rubber shoes prevents the flow of electrons through you body from the charged metal sphere to earth, as rubber is not a good conductor.

If you are standing on the ground with bare feet, then electrons can easily flow from the metal sphere to earth passing through your body. Depending on the amount of electrons initially on the metal sphere, you would get a feeling of electric shock.

But be aware that, as you should have learnt when studying electrostatics, electrostatics generally deals with small amount of charges but at high potential (in contrast to current electricity that deals with large amount of charges but at low potential). For example, 0.1 micro-coulomb (= 10^-7 coulomb) of static charge on a metal sphere of radius 5 cm would produce a potential of 18,000 volt (=18 kV), which is sufficiently high to force electrons passing through your body even if you wear a pair of rubber shoes.



2011-10-28 23:36:35 補充：
Q:my body 會否act like the earth in earthing, 去拎電子and store in my body
A: No. Electrons only flow when there is a potential difference. When you touch the charged metal sphere, you are already at the same potential as the sphere.