If a body gives out 10^9 …
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Yogita Ingle 5 years, 1 month ago
In one second 109 electrons move out of the body. Therefore the charge given out in one second is 1.6×10−19× 109C = 1.6×10-10C.
The time required to accumulate a charge of 1 C can then be estimated to be 1C÷ (1.6 × 10−10C/s)= 6.25×109s = 6.25 × 109÷(365 × 24 × 3600) years = 198 years. Thus to collect a charge of one coulomb, from a body from which 109 electrons move out every second, we will need approximately 200 years. One coulomb is, therefore, a very large unit for many practical purposes. It is, however, also important to know what is roughly the number of electrons contained in a piece of one cubic centimetre of a material.
A cubic piece of copper of side 1 cm contains about 2.5×1024 electrons.
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