# Question: Why is there no magnetic field outside a toroid?

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It is non zero only inside the core of a toroid. By definition, Ampere’s Law states that integration of magnetic field over an amperian loop is equivalent to constant μ multiplied by current enclosed. Therefore, current enclosed by Amperian loop is zero. Thus, magnetic field outside the toroid is zero.

## Why is magnetic field outside a toroid zero?

After applying Ampere’s Law, we see that the magnetic field at any point outside the toroid is zero because the net electric current is zero.

## Why is there no magnetic field outside a solenoid?

Magnetic field lines only exist as loops, they cannot diverge from or converge to a point like electric field lines can (see Gauss’s law for magnetism). … However, the volume outside the solenoid is much greater than the volume inside, so the density of magnetic field lines outside is greatly reduced.

## Is the solenoid’s magnetic field zero outside the solenoid?

Magnetic field outside a long solenoid can never be zero. Because a solenoid of finite length will have edges and field will come out. However, if we imagine a straigth solenoid of infonite length or a toroid, it will not have edges from where lines of force can come out.

## Is the magnetic field inside a toroid uniform?

The magnetic field inside a toroid is not uniform, as it varies inversely with the distance r from the axis OO’.

## What does toroid mean?

1 : a surface generated by a closed plane curve rotated about a line that lies in the same plane as the curve but does not intersect it. 2 : a body whose surface has the form of a toroid.

## Does toroid have polarity?

We can make such infinite number of cross section, therefore there exists infinite number of poles inside the toroid, but as classical magnets they donot have poles on outer surface.

## What is the magnetic field outside the ideal solenoid?

It is well known that the longitudinal magnetic field outside an ideal solenoid (i.e., one that is wound infinitely tightly and that is infinitely long) is zero.

## Where the magnetic field of a solenoid is strongest?

You can create a stronger magnetic field by taking wire and forming it into a coil; the field is more concentrated in the center of the loop than outside the loop.

## Why is the magnetic field inside a solenoid stronger than outside?

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.

## Which among the following is not affected by the magnetic field?

2. Which, among the following qualities, is not affected by the magnetic field? Explanation: A stationary charge is not affected by a magnetic field because stationary charges do not have any velocity. Magnetic field cannot occur in a particle having zero velocity.

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## Where is the magnetic field the strongest?

The magnetic field is strongest at the center and weakest between the two poles just outside the bar magnet. The magnetic field lines are densest at the center and least dense between the two poles just outside the bar magnet.

## Is solenoid a permanent magnet?

Difference between a Bar Magnet and a Solenoid

The bar magnet is a permanent magnet whereas a solenoid is an electromagnet ie, it acts as a magnet only when an electric current is passed through.

## What is toroid formula for toroid?

Magnetic Field of Toroid

The toroid is a useful device used in everything from tape heads to tokamaks. For a solenoid of radius r = m with N = turns, the turn density is n=N/(2πr)= turns/m.

## What is inside a magnetic field?

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

## What is the magnetic field due to a toroid?

The magnetic field in the open space inside (point P) and exterior to the toroid (point Q) is zero. The field B inside the toroid is constant in magnitude for the ideal toroid of closely wound turns. The direction of the magnetic field inside is clockwise as per the right-hand thumb rule for circular loops. 