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How can a simple electromagnet be made?
first, you have to have a ferromagnetic core, like an iron bolt. then, you wind a magnetic wire around it. the thicker the winding, the stronger the magnet. the tips of the wire should be protruding so you can connect it to a source. skin the tips of the wire, too. connect the wire to a dc source and you got an electromagnet.
What is gunn amplifier?
Answers.com says it is a microwave amplifier in which a Gunn oscillator functions as a negative-resistance amplifier when placed across the terminals of a microwave source.
What happens when a coil of wire cuts through a magnetic field?
If the magnetic field is fluctuating, or the coil of wire and magnetic field are moving with respect to each other, then a current is induced in the coil of wire. If the two are stationary and the magnetic field is stable, then no current is induced in the coil. However, if there is a current in the coil, from another source, then the coil and the field will exhibit a relative force that will tend to move the coil with respect to the field.
What does a armature or rotor do?
The Armature(or rotor) is a electromagnet inside a motor and alters the magnetic field inside the motor when it rotates. In DC motors it is connected to a Commutator. In AC induction motors the armature isn't connected to a power source.
When current flows in a conductor a magnetic field is created. The created magnetic field cuts the conductor which creates a voltage in the conductor. What is this voltage called?
It's called back EMF or reverse EMF. The EMF is electro-motive force, or voltage. What is happening is that the original current flow creates a magnetic field. That field then induces a voltage that opposes the original voltage that is causing the current flow. This back EMF "resists" the original voltage's efforts to cause current flow. If the created magnetic field did not oppose the original "efforts" of the voltage source to make current flow, then it would aid that voltage to make current flow. We would then get something for nothing and perpetual motion would be possible. We can't do that.
What is the region of a magnetic field?
The region around a magnet or current-carrying conductor within which the magnetic force is exerted is called the magnetic field. Magnetic fields are three-dimensional and extend infinitely in all directions from the magnetic source.
How did the earth get the magnetic field?
Because there's a magnet in the centre of the earth which is known that it's the source of gravity. It's magnetic field is around the earth obviously.
How do you use the Tesla meter?
A Tesla meter is used to measure the strength of a magnetic field produced around a magnet or current-carrying conductor. To use it, simply place the Tesla meter near the magnetic source and take a reading of the magnetic field strength displayed on the device's screen. Some Tesla meters may require calibration or adjustment before use.
How does distance affect a magnetic field?
As distance increases from a magnetic source, the strength of the magnetic field decreases. This is because the magnetic field follows an inverse square law, meaning that the farther away you are from the source, the weaker the magnetic field will be.
What equipment do you need for a magnetic field?
To generate a magnetic field, you typically need a power source to create electric current, a coil of wire to carry the current, and a core material (such as iron) to concentrate and enhance the magnetic field. Additionally, instrumentation like a gaussmeter may be used to measure the strength of the magnetic field.
Is the moon a source of earth's magnetic field?
No. The source of earth's magnetic field is the molten inner core. The moon due to its proximity of course influences our magnetic field but it is to be considered a "weak effect".
What are magnetic cars?
Magnetic air cars uses air compression as the source for propusion. It is "magnetic" in the sense that a magnetic motor is used for the air compression.
What are the specific things you need to make an electromagnet?
To make an electromagnet, you need a wire coil, a power source (such as a battery), and a magnetic material (such as iron). The wire coil is wrapped around the magnetic material, and when current flows through the coil, it generates a magnetic field, turning the magnetic material into a magnet.
Can density of magnetic field send parallel to infinity?
No, the density of a magnetic field cannot be sent parallel to infinity. The magnetic field strength decreases with distance from its source, meaning it will weaken as it spreads out from a source.
What is electromagnetic flux?
The electromagnetic force is a force that is expressed as (or that "shows up as") a "field" or a "group of lines of force" around the source. Electromagnetic flux is a direct reference to those magnetic lines of force. Electromagnetic flux is the electromagnetic field or the group of electromagnetic lines of force around the source. All the following sentences say the same thing: The electromagnetic flux around the magnet was very high. The magnetic flux around the magnet was very high. The magnetic field around the magnet was very large. The flux around the magnet was very high. The field around the magnet was very large. There were a large number of magnetic lines of force around the magnet making the field strength very high.
How do you control a magnetic field from a distance?
Surrounding a magnet with a magnetic shell can allow the magnetic field to move farther away from its source.
Why a current wire deflects a magnetic needle placed near it?
A current wire deflects a magnetic needle placed near it because the current wire is creating an electric field. If the current is supplied from an AC (alternating current source as opposed to DC which is direct current- AC would be from a wall socket, DC from a battery), then the current is constantly changing, so the electric field is constantly changing. A changing electric field results in a magnetic field perpendicular (90 degrees) to it. It is actually the magnetic field that is changing the needle direction, because that needle is trying to follow the magnetic field lines (similar to those that you see when you put iron filing near a magnet).
