# Physics magnetic field and direction

A proton is travelling with a speed of 5. By rearranging this equation, we can solve for B: Farther away, where the magnetic field is weak, they fan out, becoming less dense. Thumb Coordinates are usually right-handed. An electric current passes through a straight wire.

Field line The direction of magnetic field lines represented by iron filings sprinkled on paper placed above a bar magnet.

Two different vectors are in use to represent a magnetic field: See magnetic monopole below. Both the fields for a coil of wire and a solenoid can be constructed from this equation.

You can determine the direction of the vector by using the right-hand rule as follows: Inside a material they are different see H and B inside and outside magnetic materials.

If the curl of your right fingers represents a rotation from the direction the charge is moving to the direction of the magnetic field then the force is in the direction of your right thumb.

Figuring out the total force exerted on the charge is pretty straightforward: The magnetic field of larger magnets can be obtained by modeling them as a collection of a large number of small magnets called dipoles each having their own m. Note that no part of the body is moving in the direction of the axis arrow, which takes some getting used to.

For right-handed coordinates your right thumb points along the Z axis in the positive direction and the curl of your fingers represents a motion from the first or X axis to the second or Y axis.

In electricity and magnetism, the force exerted on a moving charged particle when moving in a magnetic field B is given by: It passes simultaneously through a magnetic field of 0. And, any net force on the magnet is a result of adding up the forces on the individual dipoles.

Magnetic field lines are like streamlines in fluid flowin that they represent something continuous, and a different resolution would show more or fewer lines.

The direction of the magnetic field at any point is parallel to the direction of nearby field lines, and the local density of field lines can be made proportional to its strength. When you curl your fingers around, they will point out of the page.

Magnetic pole model and the H-field[ edit ] The magnetic pole model: They are made of ferromagnetic materials, such as iron and nickelthat have been magnetized, and they have both a north and a south pole.

The H-field, therefore, is analogous to the electric field E, which starts at a positive electric charge and ends at a negative electric charge. Make a sketch of this situation and indicating the directions of the velocity of the proton, the magnetic field and the magnetic force.

In order to determine the strength of a magnetic fieldsome useful mathematical equations can be applied. Vector lines pointing out of the page are represented by circles with a dot in them. Magnetic field and permanent magnets[ edit ] Main article:Physics Lecture Fall Quick Note on Magnetic Fields Like the electric field, the magnetic field is a Vector, having both direction and magnitude We denote the magnetic field with the symbol B r.

The magnetic field created by current following any path is the sum (or integral) of the fields due to segments along the path (magnitude and direction as for a straight wire), resulting in a general relationship between current and field known as Ampere’s law.

Magnetic fields are extremely useful. The magnetic field of the Earth shields us from harmful radiation from the Sun, magnetic fields allow us to diagnose medical problems using an MRI, and magnetic fields are a key component in generating electrical power in most power plants. In this topic you'll learn about the forces, fields, and laws that.

Both the strength and direction of a magnetic field varies with location. As such, In modern physics, the electromagnetic field is understood to be not a classical field, but rather a quantum field; it is represented not as a vector of three numbers at each point.

Lorentz Force Law. Both the electric field and magnetic field can be defined from the Lorentz force law. The electric force is straightforward, being in the direction of the electric field if the charge q is positive, but the direction of the magnetic part of the force is given by the right hand rule.

Index. The Physics Classroom» Physics Interactives» Magnetism» Magnetic Field The Magnetic Field Interactive allows a learner to explore the magnetic field surrounding a simple bar magnet.

A compass can be dragged about in the space surrounding the bar magnet and the effect of the magnet on the compass needle can be observed.

Physics magnetic field and direction
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