Why does electircity cause magnetism?

Question

Why is that a wire carrying current acts like a magnet?
You're a genius if you know....

Using Vice-versa is always not possible
If magnetism can produce electircity, it may not be possible for electricity to produce magnetism.Also, if someone says that if you pass electricity through a wire , it acts like a magnet ........I know it does, but WHY?
You're genius if you know....

Answer 1

The magnetic field is the relativistic aspect of the electric field, see the reference. Einstein was the genius who figured this out in 1905. You don't need to be a genius to read the reference and learn that.

Maxwell's equations show the symmetric relationship between a changing electric field and a changing magnetic field, a vector cross product. It's this continuous interchange that allows electromagnetic energy to propagate as light. After a lot of study and practice, a good student can learn to do the calculus and work out all the interactions. But then you learn that this electromagnetic energy is quantized. You are stunned, and then you go back to square one to try to figure that out. Eventually, a bunch more geniuses got that worked out and formulated quantum electrodynamics (QED), then quantum chromodynamics (QCD). Now, a whole bunch more geniuses are trying to get all that connected with gravity. They have not yet succeeded.

Answer 2

You have stated, "If magnetism can produce electricity....."

Basically your notion about production of electricity using magnetic field is wrong.

It is not the magnetic field that has produced the electric emf across a conductor.

On the other hand it is the mechanical work done by an external force which moves a magnet { field } across a conductor which has been converted into electrical energy which produces a current in the conductor and which is again dissipated as heat energy given by I^2 R.

Thus the mechanical energy is converted into heat energy via electrical energy.


Consider a closed conductor or solenoid. Whether a push a magnet along the axis of the solenoid or pull it away from the solenoid emf is induced in the coil. In both directions you are doing work and this work is converted into electrical energy. {It is analogous to work done against friction; the work is done irrespective of direction of fore in the case of friction}

One will find it difficult to push a magnet inside a coil and similarly will find it difficult to pull a magnet out of a coil. It is because he has to move a magnet against the magnetic field produced in the coil.

Thus magnetism do not produce electricity, it is the external work done by one magnetic field on another magnetic field.

A static magnetic field does not produce electricity.

A conductor simply placed in a magnetic field doesn't produce current or emf.

THE MOTION OF EITHER THE CONDUCTOR OR THE MAGNET OR BOTH PRODUCE E.M.F

On the other hand a current in a coil always produce a magnetic field around it.

As long as the current is constant the magnetic field is constant

Whenever there is a change in the current there is a change in the magnetic field associated with this conductor carrying current.

When there is no current in the coil there is no magnetic field in the coil.

A current carrying conductor placed in a magnetic field experience a force.

Similarly a magnetic field when FORCED to cut a conductor a current passes through the conductor in such a way that it opposes the motion producing the current in accordance with the conservation of energy principle.

Answer 3

Magnetism is an effect of relativity on the electric force.

Consider a wire with an electric current, specifically that negatively charged electrons are moving along the wire to the right. So there are electrons in the wire, separated by an average length L, all traveling to the right at the same speed. Now, for the wire to be electrically neutral, there must also be positive charges in the wire, all stationary but also separated by length L.

Since the wire is electrically neutral, a stationary test charge next to the wire feels no electric force, or indeed, any force at all.

But consider what happens when the test charge moves to the right. The electrons in the test charge's frame are not moving as fast, so the separation between them is BIGGER, because it is less length-contracted than in the lab frame. Similarly, the separations between positive charges are SMALLER due to relativistic length contraction, because in the test charge's new frame they are in motion to the left.

The result: the moving test charge does not see the wire as electrically neutral! It now has a net positive charge! And hence, it feels an electric force. In the lab frame, we call this "magnetism."

Answer 4

Because, a moving charge creates a magnetic field... and a wire carrying current is just a collection, or group of charges moving together.

WHY does a moving charge create a magnetic field??? BECAUSE it's the LAW of PHYSICS. Earth's magnetic field is created from electric currents. GOD made it that way. Without the earth's magnetic field we wouldn't be protected from the sun's solar winds.

The discovery of magnetism caused by current carrying wires were found experimentally, there is no explanation as to why. Scientists knew that a non-moving charge created an Electric Field, so they just said... What if we make it move... and walah! They discovered a magnetic field.

Equation for Magnetic feild of an infinitly long current carrying wire at a point radially outward from the wire:
B= (mo I) / (2pi*r)
mo= 1.26E-6
I=current
r= distance away from wire

Answer 5

Electricity and magnetism are two aspects of the same force...called creatively the electromagnetic force. Because of this relationship, electricity can be used to produce magnetism, and vice versa.

Answer 6

When current flows in a wire, a magnetic field is created around the wire. From this it has been inferred that magnetic fields are produced by the motion of electrical charges (movement of electrons). A magnetic field of a bar magnet thus results from the motion of negatively charged electrons in the magnet.

Answer 7

It is just vice versa ,Electricity produced cause of magnetism.same thing is repeating. Just energy convertion.whenever a conductor cutting the magnetic line of force electricity induced in that coil ,if you apply same electricity it will produce magnetic effect.

Answer 8

electricity polarizes the electrons on atoms. Voltage is caused by electrons jumping from one atom to another. Magnetism is caused by how fast the electrons ROTATE.

Answer 9

electromagnets.. coil a live wire around a metal pole and turn on the power and u will get an electromagnet

Answer 10

What is electircity?