# Frequent question: Why magnetic field is solenoidal?

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A solenoid is a long coil of wire wrapped in many turns. When a current passes through it, it creates a nearly uniform magnetic field inside. … The energy density of the magnetic field depends on the strength of the field, squared, and also upon the magnetic permeability of the material it fills.

## Why magnetic field is strong inside the solenoid?

When a direct electric current is passed through it, the shape of the magnetic field is very similar to the field of a bar magnet. The field inside a solenoid is strong and uniform. The small magnetic fields caused by the current in each turn of the coil add together to make a stronger overall magnetic field.

## Why is the magnetic field zero?

If the magnitude and direction of the velocity of the particle are constant, then the particle has zero acceleration. From Newton’s second law, we know that the net force on the particle is zero. But there is no magnetic field and, hence, no magnetic force. Therefore, the net force is the electric force.

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## What does Solenoidal mean?

Solenoidal has its origin in the Greek word for solenoid, which is σωληνοειδές (sōlēnoeidēs) meaning pipe-shaped, from σωλην (sōlēn) or pipe. In the present context of solenoidal it means constrained as if in a pipe, so with a fixed volume.

## What happens to magnetic field when current is increased?

Current is directly proportional to magnetic force for a straight current carrying conductor in a uniform magnetic field. So the force is directly proportional to the size of the current. … If the current is increased by five times the force will also increase by five times.

## What is meant by magnetic field?

A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A charge that is moving in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field.

## Can the magnetic field be zero?

A: It’s not really true that magnetic field lines cannot cross, but where they do, the magnetic field strength has to be zero. Here’s why: A magnetic field line is that path in space that points in the direction of the magnetic field at every point along it. … Magnetic field lines tend to follow closed loops, though.

## Where is the magnetic field 0?

Looking at the middle portion of our diagram, we see that point meets this condition: the distance from to wire is three times the distance from to wire . This means it’s at point that the magnitude of sub is equal to the magnitude of sub . In other words, the magnetic field is zero.

## Why is electric field perpendicular to magnetic field?

Also according to Faraday’s law of electromagnetic induction, changing magnetic field will create an electric field perpendicular to it’s direction. That is why in an electromagnetic wave, electric and magnetic fields promote each other in directions perpendicular to themselves. So they are perpendicular.

## What is meant by toroid?

In mathematics, a toroid is a surface of revolution with a hole in the middle, like a doughnut, forming a solid body. The axis of revolution passes through the hole and so does not intersect the surface. … A g-holed toroid can be seen as approximating the surface of a torus having a topological genus, g, of 1 or greater.

## What does it mean if divergence is zero?

zero divergence means that the amount going into a region equals the amount coming out. in other words, nothing is lost. so for example the divergence of the density of a fluid is (usually) zero because you can’t (unless there’s a “source” or “sink”) create (or destroy) mass.8 мая 2011 г.

## What does it mean to be Irrotational?

An irrotational vector field is a vector field where curl is equal to zero everywhere. If the domain is simply connected (there are no discontinuities), the vector field will be conservative or equal to the gradient of a function (that is, it will have a scalar potential).

## Is vector field conservative?

As mentioned in the context of the gradient theorem, a vector field F is conservative if and only if it has a potential function f with F=∇f. … One can show that a conservative vector field F will have no circulation around any closed curve C, meaning that its integral ∫CF⋅ds around C must be zero.

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## What are Solenoidal and rotational field?

Solenoidal vector field and Rotational vector field are not the same thing. A Solenoidal vector field is known as an incompressible vector field of which divergence is zero. … On the other hand, an Irrotational vector field implies that the value of Curl at any point of the vector field is zero.

## Is magnetic field Solenoidal?

A solenoid is a long coil of wire wrapped in many turns. When a current passes through it, it creates a nearly uniform magnetic field inside. Solenoids can convert electric current to mechanical action, and so are very commonly used as switches. 