No. Magnetic fields are a force field which must remain stable. If you make one small change in the surrounding magnetic field, like moving the Earth or increasing the radius of a magnet, this can alter the force field and create a much smaller changes in the magnetic field. To keep a magnetic field stable you would have to make smaller and smaller changes, and there are no reliable theories showing how we can do that. The effect caused by a magnet must stay the same, otherwise we would see a change in the magnetic field caused by the movement of the electromagnet which could damage the magnets, producing an intermittent voltage which would affect the devices. In practice magnets are very difficult to maintain their magnetic field strength and it could take thousands of hours to achieve this. An important difference with magnets is they are not magnetic poles. So they have a direction of repulsion rather than a direction of attraction.
How does electricity flow through a coil of wire?
Electricity flows across wires in a coil of wire in one of three ways: a) through the insulation; b) in the conductors (in this case the lead wire); or c) through the insulation where there is a gap of some length. When electricity passes through a conductor of metal, the electrons are accelerated. The velocity is calculated by the amount of energy that is transferred to the conductor.
If a conductor is not insulated, the electrons in the electricity don’t accelerate to the same speed and arrive at the ground (positive charge) faster: instead, they are slowed down and arrive at the ground (negative charge) later: a) and b). When a conductor is covered with metal and there is a gap of some length, electrons are accelerated and arrive at the ground at approximately the same speed regardless of the type of metal. The voltage of a current in this situation is exactly 0 V/m (0 V or V = current times voltage). You might note that an electric current is a force field and a force field is created by a current. The acceleration caused by the current, or force, can be calculated using formulas derived from Maxwell’s equations. The acceleration occurs only in the current phase. The electric field that occurs when a current flows in a conductor is due to a magnetic field.
The field at the point where a current flows into the conductor is called the dipole moment of that conductor. It is calculated by multiplying the electric current that flows out of the conductor. The dipole moment is the distance a small current pushes out of
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