# Tag Info

## Hot answers tagged inductance

Accepted

### What happens to an inductor if the stored energy does not find a path to discharge?

Suppose an inductor is connected to a source and then the source is disconnected. The inductor will have energy stored in the form of magnetic field. But there is no way/path to discharge this ...
• 27.6k

### What happens to an inductor if the stored energy does not find a path to discharge?

It depends. You cannot disconnect an ideal inductor from an ideal voltage source with an ideal switch. These ideal things will break your calculations and you will get an infinite voltage on ...
• 6,113
Accepted

### Where does the extra energy come from in an LC circuit?

The energy is not used up. It goes to the magnetic field, and when the magnetic field is at its strongest value there is no energy left in the electric field of the capacitor. But then the magnetic ...
• 7,788
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### Are capacitors and inductors mirror images of each other?

Capacitors and inductors are images of one another under the self-inverse mapping that transforms a linear electrical network to its dual network. The network duality transformation maps the network'...
• 85.4k
Accepted

### Where does the energy stored in inductor go on opening the switch?

This is a situation where the simple rules are insufficient. You simply cannot analyze that circuit any more than you can solve x+2=x+3. What happens in the real world is that the inductor creates ...
• 43.1k

### Are there analogs to resistance, inductance, capacitance, and memristance connecting the weak force to electromagnetism?

There is no analogy of "voltage", "current", "charge" or "flux" to electromagnetism for the weak force, at least none that would be helpful. The reason for this is that all of these are classical ...
• 108k

### Where does the extra energy come from in an LC circuit?

It depends as to whether you are considering the LC(R) circuit in isolation or with a alternating voltage supply as the driver. The series of diagrams illustrate what might happen if the capacitor ...
• 79.6k

### What happens to an inductor if the stored energy does not find a path to discharge?

But there is no way/path to discharge this energy? What will happen to the stored energy, current and voltage of the inductor in this case? In that case it makes its own circuit with its own path to ...
• 68.8k

### Is Back EMF produced in household wires?

In theory you are right. The wires indeed produce a counter-EMF. But let's get some concrete numbers. The inductive reactance of a wire is $$X_L = 2\pi f L \tag{1}$$ where $f$ is the frequency of the ...
• 27.6k
Accepted

### Is there inductance to a DC circuit?

In the limit of long times, the currents are steady, so the magnetic fields they create are steady so there is no induced EMF. This situation is usually tagged "steady state". That said, there will ...
Accepted

### Lagrangian method for an $LC$-Circuit

In this answer, I'm going to use $Q$ instead of $q$ for the capacitor charge. There is only one certain rule for finding Lagrangians: The Lagrangian is chosen such as to get the correct equations of ...
• 23k
Accepted

### Inductor and Capacitor in Parallel

My book says the current through the inductor would pick up to 0.2A, while the current through the capacitor drops to 0A. This is correct. To find the DC steady state solution for this circuit, ...
• 58.2k

### What happens to an inductor if the stored energy does not find a path to discharge?

Usually this extra energy creates a spark due to the high back emf produced. But it is not always possible for a coil to create sparks. It is clear If we try out the experiment. So what happens to ...
• 1,908

### An *actual*, relativistic, intuitive explanation for inductance…?

To echo Dale’s comment, the idea that the magnetic field doesn’t exist is an extremely common misconception for some reason. What relativity tells us is that electric fields and magnetic fields mix ...
• 53.8k
Accepted

### Self-induction in a circular coil

Notice, the magnetic magnetic field $B$ at the center of a coil carrying current $i$, with radius $r$ & having $n$ no. of turns $$B=\frac{\mu_0}{2}\frac{ni}{r}$$ hence, magnetic flux $\phi$ ...
Accepted

### Confusion in understanding the behavior of inductor in RL circuit with DC source

When we have a DC voltage source with a switch in series with RL and the switch is closed at t=0 then it is said that current is zero initially, but the voltage across inductor is same as that of ...
• 53.8k

### Why is all of the energy from a battery stored on an inductor but only 50% on a capacitor?

however I can't think of the fundamental reason as to why it is completely impossible to charge a capacitor with anything but 50% of the battery energy whereas an inductor could theoretically ...
• 58.2k

### Is it safe to apply Kirchhoff's voltage law to a closed loop containing an inductance with unsteady current?

Yes, Kirchhoff's voltage law (KVL): Sum of voltage drops across all elements connected via perfect conducting wire in series in to a closed circuit is zero. is valid for lumped element RLC circuits, ...
• 28.9k
Accepted

### Inductor and Capacitor with a DC supply

Assuming that there is no resistance in the circuit the current in the circuit will be given by the equation $I(t) = \mathcal E \sqrt {\frac CL} \sin \omega_0 t$ where $\omega_0 = \sqrt\frac {1}{LC}$. ...
• 79.6k

### Why complex numbers are used in electronics?

Using imaginary numbers for current in reactive components just happens to make the maths a lot simpler. In AC circuits there is typically some phase difference between the voltage and the current. ...
• 7,011

### What happens to an inductor if the stored energy does not find a path to discharge?

An important point which is somewhat addressed by others but perhaps not clearly enough is (quoting Scotty) "Y' canna break the laws of Physics". You can make everything ideal - semiconductor wire, ...
• 1,565

### Where does the energy stored in inductor go on opening the switch?

TL; DR: Every real circuit has a capacitance, hence decaying RLC oscillations. General points There are two general points to learn from this question: Every model in physics (and beyond) has its ...
• 40.8k

### What is zero impedance in AC circuit?

Does that mean when I apply a voltage, the current will be infinite large? No, not even in the context of ideal circuit theory. It's a bit subtle since we're using phasor voltages and currents and ...
• 58.2k
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### Magnetostatic energy density -- derivation without introducing inductance?

It's a reasonable question, and the answer is: one can't prove it, without introducing induction. Consider a conducting loop with no current. Then someone starts creating a current in it, using, for ...
• 441

### Why do old transformers make sounds, but new ones don't?

Transformers generate oscillating magnetic fields at the mains frequency and the fields produce an oscillating force on: anything nearby that's ferromagnetic (like the core) anything nearby that is ...
• 334k

### If induced voltage (back-emf) is equal and opposite to applied voltage, what drives the current?

The answer to your question lies in the fact that you are dealing with two different types of electric field (conservative and non-conservative) and that the non-conservative electric field owes its ...
• 79.6k

### Magnetic field at the center and ends of a long solenoid

since you are concerned about a long solenoid, this problem has a very simple solution. Suppose you have two identical long solenoids, each of them having magnetic field $B$ at the ends. You join ...
If you have a single tube, the current will flow on it directly without making the $N$ loops. It will result a different direction, i.e. different magnetic field, its magnetic field will be much ...