# Questions tagged [induction]

The tag has no usage guidance.

350 questions
40 views

### How to calculate induced emf of moving rod?

I have the following exercise: A copper rod with length L is moving on two frictionless conducting rails, in a distance a from an very long straight conductor. The rods resistance: R. Ignore any self ...
34 views

### Is it possible to use Ampere's law to calculate vector B around short straight line conductor?

Maybe this question sounds easy, but I would really be grateful if someone could give me an explanation if it's true or not. I'm not sure if I understand it good enough.
33 views

### Violation of conservation of energy (seemingly) in process of electromagnetic induction

A bit long question but it's really bugging me a lot. Say we have a closed circular conducting loop at rest and initially a bar magnet rests along its axis with north side facing the loop. Now we ...
29 views

### Only getting positive values for induced voltage? [closed]

We have to draw a voltage over time graph for the induced voltage in a coil for 2 whole turns. $N = 10$ $B = 30mT$ $A = 100cm^2$ The coil is rotating at 20Hz We have the formula: $2πNBAfsin(2πfT)$ ...
23 views

### Finding the voltage across an inductor when opening the switch [closed]

Well, I've the following circuit: In the circuit I want to find the voltage $\text{V}_{\text{Y}_1}\left(t\right)$ as a function of time, after I open the switch (this switch was closed 'forever' ...
56 views

### What is the QM equivalent of induction?

And regarding electron correlations, reciprocally what QM ones are strictly due to classical induction and near field effects? Edit: thanks to whoever thinks necessary to downvote questions without ...
27 views

42 views

### Effect of greater coils on induced current in a solenoid

Simple case:- A bar magnet is inserted into a solenoid with 'n' turns at velocity 'v'. The current is measured using an ammeter that is part of the complete circuit of the solenoid. My question is ...
146 views

### Do magnets attract magnetic materials by inducing magnetism in them?

Here are 2 concise excerpts from a book I have been reading:- 1.A permanent magnet produces its own magnetic field. An induced magnet is a material that becomes a magnet when it is placed in a ...
47 views

### When a charged rod is brought close to a conducting metal of any shape, is the magnitude of charge induced on the metal same as that of on the rod?

I think the question title is clear. What happens when other conducting metals are also around the rod? How could you explain intuitively?
193 views

### Statement of Lenz's law

In Lenz's law we state that direction of the induced current is such that it opposes the cause that produces it. But can we state the direction of induced emf instead of current? If by direction ...
48 views

### Will salt water spin if put in place of rotor in induction motor?

If I have a bottle of salt water and put it in place of rotor in induction motor, will the salt water spin ? Why / why not ?
67 views

### Comments on the Magnitude of Induced Charge

Is it necessary that the induced charge be always less than or equal to the inducing charge? Why can't it be greater? Could someone please explain why this happens, and to what extent can we comment ...
54 views

### Finding induced magnetic field strength given current.

I'm working on a project involving a Tesla Coil, and I was hoping to figure out how strong an induced magnetic field would be with an input voltage of X. Is there an equation to help solve this? I'm ...