3
votes
Why electric field increase near the cable connected in AC 220V socket even current is zero?
The electric field depends on the potential difference (voltage) between the wires in the cable, not on the current going through the wires. The electric field will be strongest inside the cable, ...
- 36.1k
2
votes
Accepted
Doubts in circuit analysis
Maybe I am loosing some detail here, but assuming that all resistances are equal, and looking at the symmetry of the circuit, all dpps and currents should be the same in module if you flip the circuit ...
- 130
2
votes
Why is my idea of voltage drop wrong?
To simplify matters, assume that the mobile charged particles under consideration are positive and ignore the thermal motion of the charged particles.
I am going to compare the motion of a charged ...
- 97.9k
2
votes
Why is my idea of voltage drop wrong?
Voltage drop means voltage loss, typically in the context of electrical current flowing through a series of resistors or a piece of resistive wire. Let's say we have a loop of resistive wire leading ...
- 95.5k
1
vote
Current through points with no voltage drop
That's an ammeter, not a voltmeter, and "there's no voltage drop" just suggests
the ideal-ammeter characteristic of zero resistance, as the
correct approximation to apply.
There can, of ...
- 9,943
1
vote
Circuit quantization procedure
Josephson junction can be considered classically in the regime when quantum fluctuations of the superconductor phase are small. In this case, it is simply a circuit element with a phase-current ...
- 1,011
1
vote
Accepted
How can I deduce a capacitance of a capacitor without existing formulaes?
Since you are assuming $k$ is a constant, you can take it outside of your integral formula to give
$V(t) = k \int_0^t r \space dt$
But $\int_0^t r \space dt$ is the charge $Q(t)$ that has accumulated ...
- 56.4k
1
vote
Accepted
Visualization of resistance
What does a resistor do in an electrical circuit?
The resistance of a conductor limits the amount of current that can flow in the conductor for a given potential difference.
I have been told to ...
- 73.7k
1
vote
Visualization of resistance
I have been told to think of water flowing in a pipe and which has a narrow part
I don't think the narrow pipe is a good analogy of a resistor.
In simple fluid dynamics the water in the narrow part ...
- 56.4k
1
vote
Confusing definitions of EMF
The formal definition of the electromotive force can be written as follows.
\begin{equation}
\mathscr{E} = \sum_{i} \int_{L} \mathbf {f_i} \cdot d\mathbf{l}
\end{equation}
Where $\mathbf{f_i}$ is the ...
1
vote
Accepted
How do conductors actually work in electrostatics?
There are different kinds of conductors. The common thing is charges are free to move around.
Metals are a common example. In a metal, some electrons do not stay in orbitals around individual atoms. ...
- 41.1k
1
vote
Confusion regarding phase
Yes, your understanding of phase difference is correct: if the phase difference between two waves is positive, the former is leading and the latter is lagging. Let's closely examine what Griffiths is ...
- 305
1
vote
Working of batteries and supply of charges through them when connected to capacitors
You: is there any new charge coming out of the battery?
Ans: No new charge can't come out. The total charge of the whole system will be constant (conservation of charge). Simply you can think some ...
- 11
1
vote
Working of batteries and supply of charges through them when connected to capacitors
Note that the net charge on the combination of both plates is +60 Coulombs both before and after being connected to the battery. So the battery has not "supplied" any charge. It has just “...
- 73.7k
1
vote
Weird looking sine wave behavior in an electric circuit
With competent values that you have given and assuming that the voltage source has little or no resistance then $Q=10$ and the resonant frequency is $\approx 36\,\rm kHz$.
As the $Q$ value is ...
- 97.9k
1
vote
Cannot catch a minus sign mistake when deriving the ODE for an LC circuit
You're using opposite sign conventions for the potential differences across the capacitor and the inductor.
Arbitrarily designate one terminal of the capacitor as $C_{in}$ and the other one as $C_{out}...
- 1,255
Only top scored, non community-wiki answers of a minimum length are eligible