Category Archives: What If…

Magnetic fields

Magnetic Fields

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The NASA computer animation illustrates the Earth’s space storm shield in action and shows our planet’s magnetic fields as a dynamic system.

The solar wind, a thin, high-velocity electrified gas, or plasma, blows constantly from the Sun at an average speed of 250 miles per second (400 kilometers/sec). In the animation this is represented as a stream of yellow particles flowing from the Sun. The solar wind impacts the Earth’s magnetic field, represented by the blue lines. As the solar wind flows past the Earth’s magnetic field, it generates enormous electric currents that heat Earth’s space storm shield, which is a layer within the ionosphere (Earth’s electrically charged outer atmosphere). Satellite observation has shown that this causes electrically charged oxygen atoms (oxygen ions) to be ejected from the ionosphere into space.

The expelled oxygen ions are represented by the green particle streams. The ejected oxygen ions gain tremendous speed as they leave the atmosphere, become trapped by the Earth’s magnetic field and ultimately encircle the Earth, where they form a billion-degree plasma cloud around the planet, represented by the red cloud. The blue doughnut shape represents the high-speed flow of these particles around the Earth.

The red ‘ring of fire’ around the Earth’s polar regions represents the contribution of the particles to the aurora (the northern and southern lights).

This is part of the mechanism by which earth is constantly bombarded by charged particles from the sun as we travel through space and time. It’s as if we are living our our lives on a component of an electrostatic generator whose scale defies comprehension.

Peter Terezakis
ITP
Tisch School of the Arts
http://www.terezakis.com

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Lenz’s Law –

When Jeff Feddersen showed our class a demonstration of power generation, I was impressed by the visible effects of Lenz’s law when an electrical load was placed on the hand-cranked generator.

” Lenz’s law states that the current induced in a circuit due to a change in the magnetic field is so directed as to oppose the change in flux or to exert a mechanical force opposing the motion.” – Heinrich Lenz, 1834

We are surrounded by this effect – and the work that it does.

The past week I have reading and visualizing about the physics and models of magnetic waves, induction, electro-magnetic fields (EMF), magnetic moments, which brought me to Lenz’s law.
The subject is complex and filled with calculus the nuances of which are difficult to comprehend.
Looking at the “Cliff Notes” version, the concept is straight forward:

Field energy

The electric field stores energy. The energy density of the electric field is given by:

In general the incremental amount of work per unit volume δW needed to cause a small change of magnetic field δB is:
    \delta W = \mathbf{H}\cdot\delta\mathbf{B}.

Conservation of momentum

Momentum must be conserved in the process, so if q_1 is pushed in one direction, then q_2 ought to be pushed in the other direction by the same force at the same time. However, the situation becomes more complicated when the finite speed of electromagnetic wave propagation is introduced (see retarded potential). This means that for a brief period of time, the total momentum of the two charges is not conserved, implying that the difference should be accounted for by momentum in the fields … Maxwell called this the “electromagnetic momentum” … Wikipedia .

Since taking apart my first motor to pull out the magnets when I was a child, to looking at motors today, every model that I have ever seen – in person or on paper – has either the magnet or the coil as a stationary object.

What if the magnetic resistance due to induction was allowed to self-optimize/be reduced within a given system? Aside from conserving momentum, would EMF be reduced, stay the same, or increase?

I’m thinking that I would like to design, construct, and analyze, an experiment and its outcome.

Peter Terezakis
ITP
Tisch School of the Arts
http://www.terezakis.com

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What If…

Schumann Resonance - Earth as a Capacitor
What if we think of our planet as a spherical capacitor?

Two concentric plates, separated
by a dielectric, moving through
the volume of space.

Formula to determine the
capacitance of a sphere

Using this model, earth ground would be our planet, the insulating dielectric would be the atmosphere, and the second capacitive component (plate) would be the ionosphere.
Capacitors often arc/leak/discharge on the work bench:
An average bolt of negative lightning carries a current of 40 kA (kiloampreas) although some bolts can be up to 120 kA, and transfers a charge of 5 coulombs and 500 MJ

Which would mean that there should be a change in electrical potential as we leave earth ground/change observational altitude:

Alessandro Volta’s measurements of electrical potential above the earth. Confirmed in 1908

I know it’s more than a little whacky, and way over-simplified, but I keep thinking about the dynamic differences in electrical potential between moving bodies of air and earth ground as well as between the ionosphere and the earth.

Tesla patent 512340

I can’t help but wonder since there is enough electromotive force to operate an electroscope, bias a MOSFET, might there not be a way to construct an antenna to at least charge a battery, if not power a city, or the planet, using the power which surrounds us on a planetary and/or a cosmic scale?
Traveling through magnetic fieldsl
If the answers to these questions were easy, or already out there, Big Oil would be out of business, and they are not.
tesla-645576

The scale and scope of this line of thinking is mind-boggling and very interesting to me. There is a  recurring common symmetry in Tesla’s drawings, NASA imagery, and models of basic physics which I find intellectually compelling and aesthetically satisfying.  How cool would it be to continually charge super-capacitors through a system of antennas, powering our cities and our homes, by the EMF naturally generated by nature?

Peter Terezakis
ITP
Tisch School of the Arts
http://www.terezakis.com

Moving plate capacitive discharge photo from NASA