Is it possible to project a magnetic field further away from a coil's boundaries ?
147664
It's not clear from your question, are you trying to design an antenna?  What is the purpose of this experiment?\n\nIf you want to build an antenna, I would suggest a magnetic dipole.  This is the old fashion UHF type attenna (the loop).
115436
With a Magnetometer. See below for more detail.
609714
Take a compass and a bar magnet and let them trace the field lines. Or better yet, take a piece of paper with metal shaving on it, then place a magnet underneath. The shaving will align with the field lines. Pretty cool.
640993
The magnet in an earphone encloses a coil of wire that is attached to a diaphragm that vibrates the air to make the sound. The coil does most of the vibrating. In any case, the magnet's field is concentrated in the part of the earphone where the coil is, to maximize efficiency. The electric current coming to the coil (from the player) sets up a fluctuating magnetic field around the coil that interacts with the fixed field from the magnet to move the coil, and hence the diaphragm. The magnetic fields drop off rapidly with distance, and a centimeter away, at your scalp, would be negligible. \n\nJust below the dry outer epidermal layer, your skin is a good conductor of electricity, and therefore provides some shielding for fluctuating magnetic fields. Any residual magnetic effects from the earphones would likely end here. \n\nEarphones operate on minute currents. The sound level required is very low, and so is the electrical potential needed. If you cranked the current up high enough to cause the magnetic field to be a problem, you would long since have encountered a larger problem with the audio volume.\n\nWhile the FIXED magnetic field may be measurable below the scalp, the FLUCTUATING magnetic field would not. It is the fluctuating field (not the fixed field) that would cause a current in the brain.\n\nShort answer: No.
91676
I answered your question already.  Magnetic field strength is governed by amount of current flow.
135305
YES!  It's perfectly possible to _build_ such a car.  If the magnet is just attracting the car, it would pull forward on the car, and the car would pull back on the magnet.  Nothing moves.  If the magnet is attracted to an object ahead, the rig would move forward but would stop when the magnet got there.
950044
In high-energy physics, medical treatments, and space detections, quadrupole field distributions and sextupole field distributions are often required over a large spherical volume. Traditionally, these fields can be generated with cylindrical magnets. In comparison with cylindrical magnets, the spherical magnets have the advantages of smaller values of inductances, lower energy storage, and less magnetic flux leakage. The basic method derives from the target field approach that has been used to solve many of the inverse electromagnetic problems. \n\nCalculation:\n\nThe geomagnetic poles or geocentric dipole, can be computed from the first three Gauss coefficients from a main field model, such as the WMM or IGRF. Based on the current WMM model, the 2005 location of the geomagnetic north pole is 79.74°N and 71.78°W and the geomagnetic south pole is 79.74°S and 108.22°E. \n\nThe magnetic poles or dip pole are computed from all the Gauss coefficients using an iterative method. Based on the current WMM model, the 2005 location of the north magnetic pole is 83.21°N and 118.32°W and the south magnetic pole is 64.53°S and 137.86°E.\n\nThe location of the center of the eccentric dipole, sometimes known as the magnetic center, computed using the first eight Gauss coefficients for 2005.0, is at approximately (r, φ´, λ) = (552 km, 22.2°N, 141.6°E). \n\nThe task of locating the principal magnetic pole by instrument is difficult for many reasons; the large area over which the dip or inclination (I) is nearly 90 degrees, the pole areas are not fixed points, but move tens to hundreds of kilometers because of daily variations and magnetic storms, and finally, the polar areas are relatively inaccessible to survey crews (map of North and South polar wander - courtesy of Dr. John Quinn, U.S. Geological Survey retired). The Geological Survey of Canada keeps track of the North Magnetic Pole, which is slowly drifting across the Canadian Arctic, by periodically carrying out magnetic surveys to redetermine the Pole's location. The most recent survey, completed in May, 2001, determined an updated position for the Pole and established that it is moving approximately northwest at 40 km per year.
110961
you could sew flexible magnets into fabric. You may even be able to mount magnets into fabric like you would a button.  \n\nOK I GOTTA ASK... What are you making?
909147
The only situation there is for placing a trap at the far end of an antenna, is if that antenna is part of a multi-band antenna system. For instance, you could put a trap at the end of a 1/4 wave 20m antenna (at about 16 ft), then connect the other side of it to an additional element, for 40m or 80m use.  If the antenna is for 160m, the only reason to have an extension is for BCB or LW coverage.  Is that what you're up to?  By the way, as already mentioned, the trap has to be used at a current peak (voltage node).
84144
You need to define "effect".  It also depends on the strength of the magnet, but if you're talking about something like a fridge magnet or something like that it's a very small fraction of an inch before the effect is negligible.
56086
Depending upon your application, copper probably does not make a good coil core.  If you wrap many turns of wire around a steel nail and pass a current through the wire (say from a battery) the nail will concentrate the magnetic field and you will have an electromagnet in which the tiny magnets within the steel are all aligned.  This will not happen with copper because you can not pick up copper with a magnet.  The coil will still produce a magnetic field but the copper core will not concentrate it.
78681
If you could pulse the electricity in the wire, it may change the velocity of the wire.  Look up something called Magneto-hydrodynamics
706168
We can shape magnetic fields to trap things, but those things must be moving charged particles.\n\nHumans are not magnetic and even a very strong magnetic field will not restrain them at all.
191596
Sounds like you're talking about a magnetic levitation train or maglev for short. This is not an easy project and you will likely have to fabricate the magnetic track and induction coils (still do some searching, but I don't know of anyone that carries model sized maglev material). I have included a couple of links for you to get started with. Good luck!
891753
if it is big enough... try a speaker magnet from a subwoofer.
375243
1) Assuming there are no strong EM fields near the magnet, it should behave exactly as a similar object would due to gravity. The gravitational field of the earth is too weak to produce a measurable effect for this experiment.\n\n2) You need a very long liquid filled container with a speaker on one side and a microphone on the other. Then using a computer to produce and receive the sounds, measure the time taken for the sound to traverse the distance. For accurate results the water needs be still.
86061
Flipping over wouldn't be a problem; the asker is building a magnetic monopole on the ping-pong ball.  \nIs this possible?  Check the ref.website and find "Monopole Attempt".  They say that the other pole would leak out through the spaces between the magnets.  \nSomewhere I heard there's only room for one monopole in the universe.  \nWould the first person to do it be a monopolist?