All Questions
Tagged with definition charge
31
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What is charge on a fundamental level and what is it caused by?
On bigger bodies, I've learnt so far that charge is caused by a lack or excess of electrons or protons but when you look at an electron or proton, how are they charged? what is the cause of their ...
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What stationary charges exactly mean?
When learning about magnetic fields, it is said that stationary charges do not have any effects due to magnetic fields. So when explanations are given, is the spin of the charges not considered?
And ...
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6
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Why is current defined as $dQ/dt$ even though it is not defined as the rate of 'change' of flow of charges?
I do not understand this definition. $dQ/dt$ represents the rate of CHANGE of charge flow at an instant even though current is defined as only the charge flow per unit time.
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What exactly is charge and what does it have to do with anything? [duplicate]
Often charge is defined as a measure of interaction with the electromagnetic field. However, electromagnetic field is often defined as a field produced by moving electrical charges, or relates to ...
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2
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Why isn't the charge of an electron taken to be "$-1.6 \times 10^{-19}$ coulombs" [closed]
Even though we refer to electrons being negatively charged, why is it that we don't write the charge as "-1.6 × 10^-19 coulombs"?
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Why can the Ampere not be defined as the flow of $n$ Coulomb in $n$ seconds?
1 Ampere is defined as the flow of 1 Coulomb of charge in one second. However, I do not understand why it cannot be defined as the flow of n Coulomb of charge in n seconds.
This definition is ...
3
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1
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Relating the different "notions of charges" in field theory
Thinking back to my lectures of QFT/Classical field theory, I am getting confused about the different things called charges:
First of all, we have the notion of Noether charge, i.e. the integral of ...
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Why is the capacitance calculated with small-signal variables the same as the capacitance from the basic steady-state formula? [closed]
As an electrical engineering student I am currently working at a capacitance model for transistors. To verify my model I use Sentaurus TCAD to simulate my device and create capacitance data. I ...
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Illogical choice for the new definition of the charge of the electron by the 28th General Conference on Weights and Measures
The present definition of the Coulomb, since May 20th 2019, is that one electron has a charge of exactly
$1.602176634 \times 10^{-19} $C
Previously, the Coulomb was defined (through the Lorentz force ...
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Can we define charge as a measure of something or in terms of interactions?
like we define mass to be the measure of inertia or how much a body can interact with space time or with Higgs field, there must be a way to define charge as a measure or in form of some interaction. ...
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4
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The definition of Electric field?
In Raymond Serway's physics textbook, the definition of the electric field vector, was that it's force vector acts on a positive test charge, given as force divided by the test charge:
$$\...
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Is electric field lines always towards the negative charge?
Let an electron be placed at a distance from a $-q$ charge. We learned that electric field lines are into the negative charge. But here direction of force on electron due to negative charge is away ...
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2
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What is a current?
I am confused. One GCSE video on YouTube says it is a flow of electrons around a circuit; while, my textbook says it is a flow of charge around a circuit, carried by electrons. Since charge can be ...
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What does "dynamical symmetry of charge" mean?
I was reading the following Wikipedia article on charge and I encountered the following sentence:
In the case of local, dynamical symmetries, associated with every charge is a gauge field; when ...
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Scientific Notation for Different Units of Charge
Sorry in advance for the basic question, I’m pretty new to physics. I’m doing some electromagnetism homework and so far in class we’ve used only nano and micro coulombs in our force and electric field ...
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