# Question: Does a solenoid always have a magnetic field?

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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 magnetic field within a solenoid depends upon the current and density of turns.

## Why is the magnetic field in a solenoid constant?

The magnetic field inside a solenoid is proportional to both the applied current and the number of turns per unit length. There is no dependence on the diameter of the solenoid, and the field strength doesn’t depend on the position inside the solenoid, i.e., the field inside is constant.

## How does a solenoid produce a magnetic field?

You can create a stronger, more concentrated magnetic field by taking wire and forming it into a coil called a solenoid. Magnetic fields are produced by electric currents; a simple segment of current-carrying wire will generate around it a circular magnetic field in accordance with the right hand rule.

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## 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.

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

The magnetic field lines exist outside the solenoid, but the number of field lines per unit area outside the solenoid is much less compared to the number of lines per unit area inside the solenoid. Hence the magnetic field outside is so feeble that it is considered to be practically zero.

## How do you calculate the magnetic field of a solenoid?

Solenoid magnetic field equation

1. B is the magnetic field,
2. µ₀ = 1.25664 * 10^-6 T*m/A is the vacuum permeability,
3. N is the number of turns in the solenoid,
4. I is the electric current,
5. L is the length of the solenoid.

## What are the factors affecting solenoid?

The magnetic field within a solenoid depends upon the current and density of turns. 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. Iron has a much, much larger permeability than a vacuum.

## Is magnetic field inside a solenoid is uniform?

Inside the solenoid, the magnetic field lines are approximately uniform and parallel to one another, which implies that the magnetic field is also uniform inside the solenoid.

## 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.

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## Does the magnetic field outside the solenoid depend on the distance from the solenoid?

1. Does the magnetic field outside the solenoid depend on the distance from the solenoid? Yes, the magnetic field is stronger closer to the solenoid.

## What is the nature of magnetic field outside the solenoid?

One end of the solenoid acts as a north pole whereas the other end acts as a south pole. When current passes through it, magnetic field is produced both inside and outside the solenoid. However, the strength of the magnetic field is stronger inside the solenoid as compared to outside.

## What will be the magnetic field outside a long current carrying solenoid?

However, the volume outside the solenoid is much greater than the volume inside, so the density of magnetic field lines outside is greatly reduced. Now recall that the field outside is constant. In order for the total number of field lines to be conserved, the field outside must go to zero as the solenoid gets longer.

## Where is the magnetic field weakest in a solenoid?

The field inside a solenoid is strong and uniform. The small magnetic fields caused by the current in each coil add together to make a stronger overall magnetic field. Outside the solenoid, the small magnetic fields from each wire cancel each other out and the outside field is much weaker.

## What will be the magnetic field inside a long current carrying solenoid?

The magnetic field inside a long straight solenoid carrying current (a) is zero. 