Charge conservation
Charge conservation
Charge conservation is
Embedded Files
Law of Conservation
Law of Conservation
The Conservation Law says the total charge is conserved in a space, charges are neither created/destroyed, only transferred from a system to another.
It has always been correct in any experiments for centuries.
[1] Box metaphor
[1] Box metaphor
E.g. 1.1 Suppose a box has charges:
1 charge of 2+ C (Coulomb_
one of -3 C
one of +5 C
Conservation Law says if the box is closed, no charge enters/exit--total charge is constant.
It's mathetmatically written as:
Σ: sum
q = variable
The equation says "If we add all charges in a region, no charges enters/leaves, then the total charge is constant."
The box's total charge is 2c+5c-3c = 4c. But if its charges touched and may change identity, and may get 8 particles, added up this time, the total charge is 4c.
1.2 E.g. If it has a proton going into another particle very fast, with enough energy, we may not get a proton/electron, but muons/quarks.
If the box now has charges of: 1C, -7C, -4C, qC, together its total charge is still 4c.
What does qC equals? qC = 4-(1-7-4) = +14C
More examples
More examples
1# It's impossible for an 'X' particle with +3C decays and turns into 'Y' and 'Z' particles of +2C and -1C respectively, because it gives 2-1 = 1C.
2# 'X' has -2e charge and Y has +4e charge. If they touched, what's a potential final charge per object?
Total charge is 4-2 = 2e and each particles may have 1e charges.
3# A particle of charge +2e decays into 2 new particles.
If one has '-e' charge, what's Q particle?
-e+Q = +2e
Q = +2e+e = +3e
As total charge is +2e, Q particle = +3e.
The 2 particles' total charge is +4e. Electrons redistribute so the rod is less positive charged and the sphere is positively charged, and protons stay fixed.
Negative charge process
Negative charge process
A neutral object becomes negatively charged if electrons transfer from another object.
The image shows a negative conducting rod with net charge -4e touching a neutral conducting sphere.
2 electrons move from the sphere to rod due to being attracted to positive charge and want to spread out from other electrons.
Now the rod and sphere both have +2e net charges.
Misconceptions Objects don't get positive charge by having more. Protons have positive charge and are bound to the object, while electrons are transferred between objects. If an object’s net charge is more positive, it lost electrons.
Quizzes
Quizzes
[Q1]
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