Why is it not possible to induce current from the Earth's magnetic field? I thought Maxwell said that electric fields and magnetic fields were the same thing.

Talon Mcbride
2022-07-17
Answered

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Coleman Ali

Answered 2022-07-18
Author has **13** answers

The law of induction of electromotive force is $\mathscr E = -\text d \Phi / dt$ where $\Phi$ is the magnetic flux. Thus, for generating an electromotive force $\mathscr E$ a variable magnetic field is needed in your coil. I am not sure whether the magnetic field of the Earth varies in time at all, and surely not as quickly and in the form as needed for producing current in your coil.

asked 2022-08-20

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

asked 2022-08-12

Imagine that I use a long wire to create an electromagnet. Let's also assume that the current flowing along the wire is constant, and that the wire is winded on the vacuumm.

Is the magnetic field generated by this electromagnet (current flowing over an arbitrary path on a finite volume) proportional to the current?

Is the magnetic field generated by this electromagnet (current flowing over an arbitrary path on a finite volume) proportional to the current?

asked 2022-08-21

$\Delta I= \Delta Q / \Delta t = \vec J \cdot \Delta \vec s$

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.

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.

asked 2022-08-21

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?

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?

asked 2022-08-10

Heat means stored kinetic energy in matter. Microwave owens and induction heaters works on increasing kinetic energy on matter. Is it possible to make inverse of this heaters like cooler. Can we decrese kinetic energy by using like electromagnetic slower device? It will change many things in engineering.

asked 2022-07-22

Two charged bodies create a superposition of electrostatic fields at a point and there is no evidence of fields interference. Now, if we put two current circuits around the charged bodies then we create also magnetic fields and as a consequence two electromagnetic fields. If the electrostatic field and the magnetic field from the two positions don't interfere as waves when independently acting will their combination in the form of electromagnetic field show interference properties when combined?

asked 2022-08-30

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?

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?