# Discover the Duration of Magnetic Field Appearance with an Electromagnet

• Caelus
In summary: However, it would seem that gravity would have a much more significant effect on photons, which are massless.
Caelus
if you turn on an electromagnet, how long does it take the field to apear?

I'm not 100% positive, but I think it is at the speed of light.

As far as i know, it is the speed of light. Also, PLEASE edit your title and change Feild to Field. It's really bugging me lol! And it helps with the search function if someone wants to search for a Field.

Caelus said:
if you turn on an electromagnet, how long does it take the field to apear?

Hmmm, the question can be a little misleading (particularly the word appear!). I agree with the above that it is the speed of light if you are asking about the propagation delay.

Another way to interpret your question is in terms of circuit theory assuming infinite propagation speed. Then you are really talking about the circuit time constant. This then depends on the circuit. However, if you basically have an inductive circuit with resistance, (as might be typical), then the time constant is

$$\tau={{L}\over{R}}$$,

where R is the resistance and L is the inductance. This is a first order response and it takes about five time constants to effectively reach the steady state field. Steady state is when the field is effectively constant which seems to be a different meaning than "appear".

Ah, good call steven.

Perhaps the OP is talking more about the circuit itself.
That is, "I press the power button for an electromagnet. How long does it take for the magnetic field to start propagating?"

Im finding the question hard to word. if you had two spaceships 600,000,000 meters from each other and one turned on a really powerful electormagnet, how long would it take the other spaceship to detect it (ignoring the resistance in the magnet)?

well the speed isn't infinite or antennas wouldn't work.

Drakkith said:
As far as i know, it is the speed of light. Also, PLEASE edit your title and change Feild to Field. It's really bugging me lol! And it helps with the search function if someone wants to search for a Field.

We can edit our titles?

Caelus said:
Im finding the question hard to word. if you had two spaceships 600,000,000 meters from each other and one turned on a really powerful electormagnet, how long would it take the other spaceship to detect it (ignoring the resistance in the magnet)?

Converts to: 372,822.7 miles.
As the speed of light(also magnetism) is 186,282 miles per second, this equates to:
2 seconds.

Magnetic fields arn't affected directly by gravity right?

Caelus said:
Magnetic fields arn't affected directly by gravity right?

The full nature of gravity is not understood.
It does seem to affect everything, even massless photons.
However, the SIGNIFICANCE, or magnitude, of effect is most important.

Gravity seems to be an immutably pervasive but VERY weak force.
My initial thoughts are that, yes, magnetism is affected by gravity.

## What is an electromagnet?

An electromagnet is a type of magnet that is created by passing an electric current through a coil of wire. The current creates a magnetic field, which can be turned on and off by controlling the flow of electricity.

## How does an electromagnet work?

An electromagnet works by converting electrical energy into magnetic energy. When a current flows through the wire, it creates a magnetic field around the wire. The strength of the magnetic field can be increased by increasing the current or by increasing the number of coils in the wire.

## What factors affect the strength of an electromagnet?

The strength of an electromagnet is affected by the amount of current flowing through the wire, the number of coils in the wire, and the type of core material used. A larger current and more coils will create a stronger magnetic field, while using a ferromagnetic core, such as iron, will also increase the strength of the electromagnet.

## How do you measure the duration of magnetic field appearance with an electromagnet?

The duration of magnetic field appearance with an electromagnet can be measured using a device called a Gaussmeter. This device measures the strength of the magnetic field and can be used to determine how long the field remains present after the current is turned off.

## What are the practical applications of studying the duration of magnetic field appearance with an electromagnet?

Studying the duration of magnetic field appearance with an electromagnet has many practical applications, such as in the development of electric motors and generators, magnetic levitation technology, and medical imaging devices. It can also help scientists better understand the behavior of magnetic fields and their effects on different materials.

Replies
10
Views
569
Replies
2
Views
467
Replies
2
Views
2K
Replies
1
Views
848
Replies
41
Views
4K
Replies
6
Views
961
Replies
6
Views
1K
Replies
4
Views
1K
Replies
9
Views
1K
Replies
14
Views
397