Strengthen Your Electromagnets Skills with Plainmath's Expert Help and Resource Collection

Light is an Electomagnetic wave. When I create an electromagnet by passing electricity wound around a core and keep changing the electric field, does it emit photons?
Is the frequency of electromagnetic radiation equals the frequency of change in the electric field? If yes can it emit visible light if the frequency is in that range?

Large electromagnet using a 12" long, 3" diameter mild steel core. I'm using 18 awg magnet wire. Wire length is 3000 ft which gives me approximately 3600 turns with resistance at 18 ohms.
Case1: Using a variable transformer I dial up the voltage from 0 VAC to 120 VAC and the magnet barely picks up paper clips. The wire gets warm pretty fast.
Case2: Using a 9-volt battery the magnet is easily 10 times stronger than in case1.
Case3: Using a variable DC power supply I dial up the voltage from 0 VDC to 30 VDC. The magnet pulls nails out of my hand. It is easily 100 times stronger than case1.

If apply the electric and magnetic field separately in two perpendicular directions on a conductor then is it behaves like conductor placed in the electromagnetic field? Is" electromagnetic field "and field acting in the perpendicular directions is the same?

Why and how does the 'clock rule' of electromagnetism (i.e. current flows clockwise as seen from the south pole of an electromagnet) work?

If I put charged particles in the center of long hollow cylinder shaped electromagnet, in a vacuum, would it accelerate them?

A large cylindrical neodimium magnet or stack of same, with a coil wound around it. In an unpowered state the magnet would have a certain attraction. With one polarity of current, I would imagine the coil would amplify the permanent magnet field/attraction. With the reverse it would decrease the attraction, potentially neutralise or invert it. Is this feasible or likely to damage the permanent magnet?

Hypothetical (but potential real) situation:
I am holding electromagnet that weights 1kg. This electromagnet is being used to hold up a 10kg weight.
Would I feel like I am holding 11kg, or 1kg?

When the battery terminals of the flashlight are briefly connected and turned off, we notice a spark. It is much stronger if an electromagnet is connected to the battery. Why?

The core of the problem is "If the magnet is located in this position, what about the attraction of the electromagnet over the magnet?"
What about the dipole-dipole interaction? If suitable, the overall magnetic moment could be given by $\stackrel{\to <!--\; \to \; -->}{m}=\stackrel{\to <!--\; \to \; -->}{m_{coil}}+\stackrel{\to <!--\; \to \; -->}{m_{core}}$, where $\stackrel{\to <!--\; \to \; -->}{m_{coil}}=Ni\stackrel{\to <!--\; \to \; -->}{S}$ ($i$ = current, $N$ = number of winding, $|\stackrel{\to <!--\; \to \; -->}{S}|$ = area of a single loop). Is it correct?
If the dipole - dipole approximation is not suitable, what else?

In Lithium-Deuterium fuel, the neutrons from the fission reaction bombard the Lithium to produce Tritium and the D-T reaction occurs and we get the energy.
What about Deuterium-Deuterium fusion? Is it possible without the presence of Tritium at all ? If so, then does it release more or less energy than D-T fusion?

$\Delta I= \Delta Q / \Delta t = \vec J \cdot \Delta \vec s$
My understanding is that $\Delta$ can be replaced by $d$ which represents the differential(infinitesimally small amount) of (something). Thus, this equation becomes $dI=dQ/dt=\vec J \cdot d \vec s$. We integrate both sides and get $I=\int \vec J \cdot d\vec s=\int dQ/dt$. But I know that $I=-dQ/dt$ not $\int dQ/dt$. Can someone clear this confusion with the deltas and the differentials.

During fusion (in the Sun), how is the repulsive effect of the strong nuclear force overcome?

Light is what is more generally called "electromagnetic radiation", right? The energy radiated by a star, by an antenna, by a light bulb, by your cell phone, etc.. are all the same kind of energy: electromagnetic energy, i.e. photons traveling through space.
So far, so good? (if not please clarify)
On the other hand, there are these things called "electromagnetic fields", for example earth's magnetic field, or the magnetic field around magnets, the electric field around a charge or those fields that coils and capacitors produce.
Question:
1) Are these two things (electromagnetic fields and electromagnetic radiation) two forms of the same thing? or they are two completely different phenomena?
2) If they are different things, What does light (radiation) have to do with electromagtetism?

When an electromagnet is connected to a circuit, the electric current does not reach the required strength immediately, but gradually. Why?

Any metal conductor such as aluminium or copper is a conductor because of the free electrons in such metals.
Plasma also has free electrons so, if you can repel plasma the same way as aluminium is repelled when near an AC electro magnet?

If I bring a magnet close to a copper bar, there will be no attractive or repulsive force. Similarly, if I bring a magnet close to a copper electromagnet, still there is no attractive or repulsive force.
So can't we say that the magnetism of regular copper and a copper electromagnet the same ?
If no, then why? What difference is there between regular copper and a copper electromagnet? How does copper get changed if electricity passes through it?

Understanding Systems Fire doors are doors that, when closed, can slow the spread of fire from room to room. In some buildings, fire doors are held open by electromagnets. Explain why electromagnets rather than permanent magnets are used.

Fire doors are doors that can slow the spread of fire from room to room when they are closed. In some buildings, fire doors are held open by electromagnets. bxplain why electromagnets are Used instead of permanent magnets.

Hypothetically, why can't we wrap copper wires around car axles and turn them into electromagnets to help charge the batteries?

A working electric motor needs to have three things. Which of the following are the three?
a. a device to switch the electromagnets at the right time
b. a moving element with magnets
c. an even number of magnets
d. a stationary element with magnets