This repel and attract definition holds in all uses of magnets and magnetic fields. Keep track of which directions correspond to repulsion and attraction. For currents, which are moving charges through wires, the magnetic force can be determined as attractive or repulsive based on the locations of the wires with respect to one another and the direction the current moves. For currents in circular wires, you can use the right-hand to determine how magnetic fields emerge.
The right-hand rule for currents in loops of wires means that, if you place the fingers of your right hand curled in the direction of a wire loop, you can determine the direction of the resulting magnetic field and the magnetic moment, as shown in the diagram above.
This lets you determine how loops are attractive or repulsive between one another. The right-hand rule also lets you determine the direction of the magnetic field that current in a straight wire emits. In this case, you point your right thumb in the direction of the current through the electrical wire. The direction of how your right hand's fingers curl determines the direction of magnetic field? From these examples of magnetic field induced by currents, you can determine the magnetic force between two wires as a result form these magnetic field lines.
The magnetic fields between loops of current wires are either attractive or repulsive depending on the direction of electric current and the direction of the magnetic fields that result from them. The magnetic dipole moment is the strength and orientation of a magnetic that produces the magnetic field. In the above diagram, the resulting attraction or repulsion shows this dependency.
You can imagine the magnetic field lines that these electric currents give off as curling around each part of the current wire loop. If those looping directions between the two wires are in opposite directions towards one another, the wires will attract one another. If they're in opposite directions away from each other, the loops will repel each other.
The equation is. The cross product can be explained with geometry and another version of the right-hand rule. This time, you use the right-hand rule as a rule for determining the direction of vectors in the cross product. If the particle moves in a direction that is not parallel to the magnetic field, the particle will be repelled by it.
The Lorentz equation shows the fundamental connection between electricity and magnetism. This would lead to ideas of electromagnetic field and electromagnetic force that represented both the electric and magnetic components of these physical properties. The cross product depends on the angle between the two vectors as this determines the area of the parallelogram that spans between the two vectors. A cross product for two vectors can be determined as. Two north poles repel one another, and two south poles will also repel one another just like how like electric charges repel one another and opposite charges attract each other.
The magnetic compass needle of a compass moves with a torque, the rotational force of a body in motion. You can calculate this torque using a cross product of the rotational force, torque, as the result of the magnetic moment with the magnetic field. In other words, if you hold two magnets together so that like-poles are close together two norths OR two souths , they repel.
Try it! It feels like the magnets are surrounded by an invisible rubber layer pushing them apart. That invisible layer is called a magnetic field. Now, the magnetic field acts like a stretched rubber band pulling the magnets together. Be careful; two strong magnets can pinch your skin. When this stored-up energy is released, some of it changes into movement energy.
Well, the magnetic field that surrounds all magnets contains stored-up energy. And the way you change it will tell you which way the magnet will move. Everything in the universe follows a rule. The rule is: wherever there is stored-up energy in an object and the object is not tied down or stuck in place , then the object will be pushed in the direction that causes the stored-up energy to decrease.
The stored-up energy will be reduced and replaced by movement energy. So if two magnets are pointing with unlike-poles together north pole to a south pole , then bringing them closer together decreases the energy stored up in the magnetic field. They will be pushed in the direction that decreases the amount of stored-up energy. This pattern shows the magnetic field.
Now try it with two magnets. Point their north poles at each other. The iron filings show how the magnetic field looks when the magnets repel. Now turn one magnet in the other direction to see how the magnets attract. U niversity of W isconsin —Madison. What is Heat? What is Light? What is Magnetism? What is Motion?
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