# Induction current- velocity dependence

• dave8
In summary, the conversation discusses the challenge of calculating forces on permanent magnets and the need for a software package like ANSYS Maxwell to assist in the process. There is also mention of the desire to control the damping coefficient of a shock absorber using a system that can measure the current and the search for a relation between induction current and velocity. The individual also questions the validity of a formula involving electromotive force, velocity, magnetic field induction, and radius.
dave8
Hello,

I have to put the cylindrical permanent magnet into shaft of the shock absorber with coil around it. I need such a system which let's me to control the damping coefficient of the shock absorber so that's why a have to know the current. I can't find anywhere the relation between induction current and for example velocity of linear movement of the shaft, by the use of Faraday's Law I found that it should be that
E = vxB(Rext-Rint)
where E - electromotive force, v - velocity, B - magnetic field induction, Rext - external radius, Rint - internal radius of the magnet
But I don't think that its true because B and v vectors have the same direction.

Calculating the forces on permanent magnets is a notoriously difficult problem. You will need the assistance of a software package like ANSYS Maxwell.

## 1. How is induction current affected by changes in velocity?

Induction current is directly proportional to changes in velocity. This means that as the velocity increases, the induction current also increases.

## 2. What is the relationship between induction current and velocity?

The relationship between induction current and velocity is described by Faraday's law of induction, which states that the magnitude of the induced current is directly proportional to the rate of change of the magnetic flux through a circuit.

## 3. Can induction current be induced without a change in velocity?

No, induction current can only be induced when there is a change in velocity. This is because the change in velocity results in a change in the magnetic field, which then induces an electric current.

## 4. How does the direction of the induced current relate to the direction of velocity?

The direction of the induced current is always perpendicular to the direction of velocity. This is due to the right-hand rule, which states that the direction of the induced current is perpendicular to both the direction of the magnetic field and the direction of motion.

## 5. How is the magnitude of the induced current affected by the strength of the magnetic field?

The magnitude of the induced current is directly proportional to the strength of the magnetic field. This means that a stronger magnetic field will result in a greater induced current, while a weaker magnetic field will result in a smaller induced current.

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