# What is magnetic focusing?

## What is magnetic focusing?

Definition of magnetic focusing : the converging of a stream of electrons by means of a suitable magnetic field — compare magnetic lens.

Can you magnify a magnetic field?

Liquid sodium agitated gently in a rotating tank can significantly amplify a magnetic field.

### What is the concentration of magnetic field?

The definition of H is H = B/μ − M, where B is the magnetic flux density, a measure of the actual magnetic field within a material considered as a concentration of magnetic field lines, or flux, per unit cross-sectional area; μ is the magnetic permeability; and M is the magnetization.

How do you make a magnetic field strong?

The easiest way to create a powerful magnetic field is by creating a powerful electromagnet. Electromagnets are used for everything from powering tiny electronic switches (called relays) to lifting huge pieces of scrap metal.

## How does a magnetic lens work?

When we run electricity through a wire rolled into a tight coil, the centre is filled with a strong force called magnetism. This force pushes inwards on the electron beam. This device is called a magnetic lens because it bends the beam of electrons the same way that a glass lens bends a beam of light.

Can magnetic field be amplified?

The pre-collapse magnetic field is strongly amplified by compression in the infall. Initial fields of the order of 1010 G translate into protoneutron star fields similar to the ones observed in pulsars, while stronger initial fields yield magnetar-like final field strengths.

### How do you make a magnetic field bigger?

A high magnetic field in an electromagnetic coil can be achieved in various ways: increase the number of turns, increase current, increase the permeability, and decrease the radius. In electromagnetic coils such as solenoids, inductors, and Helmholtz coils, the magnetic field is proportional to the number of turns.

What is H field?

The H-field is the vacuum permeability, and M is the magnetization vector. In a vacuum, B and H are proportional to each other. Inside a material they are different (see H and B inside and outside magnetic materials). The H-field is measured in amperes per metre (A/m) in SI units, and in oersteds (Oe) in cgs units.

## Can electric field be focused?

Our numerical simulations demonstrate that the electric field can be focused on a fixed point, regardless of the number and location of electromagnetic sources in annular multilayers, which might be helpful for laser ignition.

Can we shape magnetic fields?

Easy answer is ‘yes’. Take a long solenoid with small diameter and deform it as you wish. The magnetic field directed along its original symmetry axis will follow the shape changes.

### Can you create a magnetic field?

While electric charges can create electric fields, magnetic fields can also create electric fields. Similarly, while magnets can create magnetic fields, electric fields can also create magnetic fields. In fact, every time you change a magnetic field, you create an electric field.

What is the physics behind the magnetic lens?

A magnetic lens is a device for the focusing or deflection of moving charged particles, such as electrons or ions, by use of the magnetic Lorentz force. Its strength can often be varied by usage of electromagnets.

## How can we change the focal length of an electromagnetic lens?

Focal length can be altered by changing the strength of the current. The focusing effect of a magnetic lens therefore increases with the magnetic field B, which can be controlled via the current flowing through the coils.

How can I amplify a magnet?

Take the magnet which has lost its power and stroke it with the stronger magnet. Linear strokes in a single direction will realign the electrons within the magnet, which will help its strength to increase. Stroke the magnet for around 15 minutes, and check to see if the strength has returned.

### Can plasma create a magnetic field?

Yes, the plasma emitted by the sun induces electromagnetic fields in Earth’s upper atmosphere and in power lines (e.g., see answers here and here for further discussion).

How can you create a magnetic field in your own home?

A magnetic field can be created by running electricity through a wire. All magnetic fields are created by moving charged particles. Even the magnet on your fridge is magnetic because it contains electrons that are constantly moving around inside.

## What is the equation for magnetic field?

We have chosen a path with constant radius, so the magnetic field at every point on the path is the same: B = . In addition, the total length of the path is simply the circumference of the circle: l = 2Πr. Thus, because the field is constant on the path, the line integral is simply: This equation, called Ampere’s Law, is quite convenient.

What is the formula for magnetic field strength?

magnetic field strength, also called magnetic intensity or magnetic field intensity, the part of the magnetic field in a material that arises from an external current and is not intrinsic to the material itself. It is expressed as the vector H and is measured in units of amperes per metre. The definition of H is H = B/μ − M, where B is the magnetic flux density, a measure of the actual

### What is magnetic field physics?

The magnetic field is a vector field – at each point it has a magnitude and direction. The direction is defined as the direction of the force that a magnetic north pole would feel at that point. Since like poles repel and opposite poles attract, this means that the magnetic field goes away from the north pole of a magnet and towards the south pole.

What is the definition of magnetic field in physics?

The magnetic field is the area around a magnet in which there is magnetic force. Moving electric charges can make magnetic fields. In physics, the magnetic field is a field that passes through space and which makes a magnetic force move electric charges and magnetic dipoles.