Magnetic Field From Coiled Wires

• KrizG
In summary, solenoids used to create a magnetic field, such as those used in electric motors, are typically coils of thin copper wires with a dielectric separating each turn of wire. This is because using a single cylindrical shell made of solid copper would result in increased electric resistance and a magnetic field in the wrong direction. The spiraling current in a solenoid is crucial for creating the desired magnetic field.

KrizG

I'm just curious why solenoids used to create a magnetic field, such as those used in electric motors are typically coils of thin copper wires with a dielectric separating each turn of wire instead of using a single cylindrical shell made of solid copper. Wouldn't using a cylinder shell made entirely of copper be more effective? Because of the decreased length, there would be much less electric resistance, and I believe the magnetic field would remain the same if the current density flowing through it were the same.

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In a solenoid, the current flows in circles, slowly spiraling towards the other side. How can you get that behavior if you used a cylinder? The current would just move straight through, and then you get a magnetic field that's not in the direction you want.

What is a magnetic field?

A magnetic field is a region in space where a magnetic force can be exerted on electrically charged objects. This force is caused by the movement of electrically charged particles, such as electrons.

How is a magnetic field created by coiled wires?

When an electric current flows through a wire, it creates a magnetic field around the wire. When the wire is coiled, the magnetic fields of each loop combine to create a stronger magnetic field that is aligned with the axis of the coil.

What factors affect the strength of a magnetic field from coiled wires?

The strength of a magnetic field from coiled wires depends on the number of loops in the coil, the amount of current flowing through the wire, and the material and thickness of the wire used. The closer the wire is coiled, the stronger the magnetic field will be.

How can a magnetic field from coiled wires be used?

Magnetic fields from coiled wires have various practical applications, such as in electric motors, generators, and transformers. They can also be used in scientific experiments to study the properties of magnetic fields and their effects on other objects.

What safety precautions should be taken when working with magnetic fields from coiled wires?

When working with magnetic fields from coiled wires, it is important to avoid placing any electronic devices near the coil, as the strong magnetic field can interfere with their functioning. It is also important to handle the wires carefully to avoid electric shocks. Additionally, it is recommended to keep the coil away from any ferromagnetic materials, as they can be attracted to the coil and cause potential hazards.