Question

Assume that you put 100 electrons in an isolated system, and after 1 billion years, (assume you have a time machine) you come back and count those electrons in that isolated system. The number of electrons you will find in the system will be?

• A.
  Count > 100
• B.
  Count <100
• C.
  Count = 100
• D.
  Count = 0

Answer 1

The correct option is C

Count = 100
According to the conservation of charge principle, if charges are put into some isolated system it will remain conserved.