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Can you make an electromagnet with a plastic core?
No, It can be considered as a electromagnet if can produce strong magnetic fields, but if iron is not present the power will decrease to a very large extent, to that extent it might not be able to attract a piece of iron and in that case it will not be considered as electromagnet.
Can a magnetic field be created?
A magnetic field can be created by running electricity through a wire. All magnetic fields are created by moving charged particles. Even the magnet on your fridge is magnetic because it contains electrons that are constantly moving around inside.
How do you build a strong electromagnetic field?
The strength of an electromagnet can be increased by increasing the number of loops of wire around the iron core and by increasing the current or voltage. You can make a temporary magnet by stroking a piece of iron or steel (such as a needle) along a permanent magnet.
Can you control a magnetic field?
The short answer is no, there is no shield or substance that will effectively block magnetic fields as such. You can however redirect the magnetic field lines, which is what some people call magnetic shielding.
How does an electromagnetic coil create a magnetic field?
The magnetic fields generated by the separate turns of wire will all pass through the center of the coil producing a strong magnetic field. Moving charged particles creates magnetic fields. This was first observed in the early 19 th century.
Which is the North Pole of an electromagnetic coil?
Electromagnetic coil. If the fingers of the right hand are wrapped around the magnetic core of a coil in the direction of conventional current through the wire, the thumb will point in the direction the magnetic field lines pass through the coil. The end of a magnetic core from which the field lines emerge is defined to be the North pole.
What happens when there is no current in a coil?
When there is no current flowing through the coil, there will be no magnetic field as well. The number of loops of the wire also affects magnetic fields. Its strength is directly proportional to the number of wire loops added to the coil. In other words, increasing the wire loops will increase the strength of the magnetic field.
How does electromagnetic induction affect the magnetic field?
Electromagnetic Induction. With more turns of wire within the coil, the greater the strength of the static magnetic field around it. But what if we reversed this idea by disconnecting the electrical current from the coil and instead of a hollow core we placed a bar magnet inside the core of the coil of wire.