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# Wireless Energy Flow Through Earths Magnetic Field

Wireless energy flow through earths magnetic field

Witricity uses a rapidly changing magnetic field to induce a current in a receiver (coil). This is based on Faraday's law of induction: \$\$U = - fracddt int vec B cdot dvec A\$\$ From this you see that a changing magnetic field is necessary.The Earth's magnetic field, however, is largely static (compass!) and certainly not fast enough to induce a measurable current in such a receiver.

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Superconducting wire in a Magnetic Field?

I suppose that the moving wire is a closed circuit and that the magnetic flux enclosed is time-dependent. The Faraday's law is of course always applicable. The current will not be infinite. Yes R=0 but, what about the self inductance L? It is never zero, in such a manner that the total E field will be null. If you make the calculations the electric field in the superconducting wire has two contributions. The first one related to the variation of the external magnetic flux and the second associated to the time-dependent current by means of the self inductance L

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How is a magnetic field generated by an electric charge?

Magnetism and electricity are related, if you move a bar magnetic inside a coil of wire it will generate an electric current likewise if you have a coil of wire and you pass an electric current through it will generate a magnetic field

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collapsing solenoid magnetic field limiter

15 volts across 4 ohms is a solenoid current of 3.75 amps.75 amps. 75 amps without producing more than 100 volts so this is a resistor of 26.6 ohms. You can connect it across the coil via a normally reverse biased diode that has a peak rating of at least 5 amps and you should be OK

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Earths Magnetic field protection from radiation?

Our Earths magnetic field is... So weak... It works with the Core, But barely, We wouldnt need to worry if we didnt have it, Cause it barely does anything. Just sits there like, "Wassup Ions Phere, NM nm, So how about you Atmosphere?"

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What materials can stop a magnetic field?

what magnetic fields no harm sounds

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What happens when a wire in a magnetic field has current run through it?

A mechanical force is exerted on the wire depending on the angle between the electrical emf force causing current and the magnetic field in space. If these are perpendicular the greatest mechanical force will be resultant and is exercised in the remaining third right angle in space. Reversing the current reverses the force. The compass question is irrevalent since it would also respond to the external magnetic field, and not just the field produced by the wire

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magnetic field? Help thanks?

i would believe Bobobobo B that the answer is both A or B, reckoning on the position aspect P is positioned interior the diagram. for the reason that I purely joined and may't vote up for his reply, yet, i am going to easily reiterate the actuality of Lenz's regulation: because the ring needs to maintain the state that it became in earlier the magnetic field became presented (imagine of the magnet as an entity displacing the twine loop from a state of equilibrium), the loop will attempt to "circumvent" the magnet (whose magnetic field factors INTO the loop, via N --> S) by technique of transferring remote from that which brought on the present interior it. you may continually imagine of Lenz's regulation as one which describes an merchandise's tendency to go back to its unique state, which, therefore, is a state of 0 cutting-edge for the twine loop. strong success! *EDIT* i am assuming that the north pole of the magnet is pointed in the route of the middle of the ring so as that both a clockwise or counterclockwise cutting-edge is brought on. If the north pole is not directed in the route of the middle of the magnet, then no cutting-edge may be brought on

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what is the cause for Earths magnetic field?

It's metallic core. The inner core is solid metal, the outer core is molten metal and it is conductive. The Earth's rotation is what makes everything work together to make it magnetic

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Are two magnetic fields better than one?

What you are asking is called the superposition principle, that is, if I have two or more magnetic sources, what will the overall effect be?The total strength of the magnetic field depends on how you arrange them.Take two two bar shaped magnets arranged in parallel. The magnetic north poles are at the bottom, the south poles accordingly at the top. Now look at the field lines, which indicate the strength of the magnetic field. The closer the field lines are together, the stronger the field. Rather than try and arrange 3 or more magnets in a triangle, ( the shape you make with the magnets is not important), compared to getting the poles to line up in such a way that they do not cancel each other out.If you buy a bar magnet, you can expect the strength to diminish by \$r^-3 \$, where r is the distance away from the magnet. In other words there is a very rapid dropout of the strength of the magnet as you move it away from the object. So you will need to have your magnet relatively close to find it.As far as I know, your best option is to buy 1 large magnet and work with that, trying to arrange more than one magnet will probably only reduce the overall field strength. Either that or buy more than one but keep them as far apart as practically possible (on a wooden frame?) to increase the chances of finding the object.

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