Answer to Question #135524 in Electric Circuits for Salome

Question

electron charge is 1,6 .10-19c is as a result of friction from one body to another moved n=5 .1012 electron,
What amount of charge was transferred to the body and how would it charge it?

Answer 1

0ne second $10^9$ electrons move out of the body. Therefore

the charge given out in one second is $1.6 × 10^{–19} × 10^9 C$ $= 1.6 × 10^{–10} C.$

The time required to accumulate a charge of 1 C can then be estimated

to be $1 C ÷ (1.6 ×\dfrac{ 10^{–10 }C}{s} )$ = = 6.25 × $10^9$ ÷ (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 centimeter of a material.

A cubic piece of copper of side 1 cm contains about 2.5 × 1024

electrons.