Magnetic Field Lines & Magnets Questions?
1) The force on the wire is in the downward direction. Use the right hand rule Magnetic field lines external to the magnet come out of the magnet's north pole, and enter the south pole, thus the magnetic field points right. Observe the bottom right picture in the following image to see how this rule works http://img43.imageshack.us/img43/8656/rh... 2) Household wiring is usually alternating current. If the axis of the compass needle is aligned or opposite the wiring, it will cause the compass to vibrate at 60 Hz when in proximity of a wire carrying alternating current. This is the case if the rotational inertia of the compass is "large". If the compass rotational inertia is "small", the compass may make complete revolutions and get going faster and faster, synchronous with the AC in the wire.
Near what points is the magnetic field about a magnet most concentrated?
Near the North and South poles. Further from the poles, the weaker the field.
A metal bar magnet has a magnetic field in the region of space around it. The magnetic field is due to?
A- Magnetic manopoles embedded in the metal B- A hidden voltage source in the metal C- The motion of charged particles in the metal D- An electric current that runs along the length of the magnet.
Regarding Magnetism and Magnetic Field?
Hello jemil_charmed, B does work on a charge only when the charge has a velocity component perpendicular to B.FALSE Yes false is absolutely correct. Because vecor B and dispalcement made if any due to Lorentz force are perpendicular to each other. So work done by B would be zero. Like magnetic poles attract. FALSE. Your answer once again correct. The direction of B is indicated by the N pole of a magnetic needle . TRUE your answer is not correct. B value at any point due to a bar magnet will have different direction depending on the location. Of course when the point is on axial line then it will parallel to the magnetic moment of the bar magnet. Magnetic moment is a vector whose direction is always directed from South to North within the bar. The magnitude of earth's B is about 1E-4 Tesla. FALSE You are right. This too changes from place to place. For a bar magnet, the B - lines exit through the N pole and return through the S pole . TRUE YOurs is correct. The earth's B lines are parallel to the earth's surface at all points.FALSE Once again you are right The vector B acts only on charges at rest. FALSE Yes you are right. Because there will be no inflence on the stationary charge by any magnetic field.
More magnet questions???
1. the alignment of the domains in the iron is what makes it magnetic. Some have their domains aligned (meaning theyre magnetic) some don't (meaning theyre not magnetic) 2. temporary magnets will eventually demagnetize (the domains will become unaligned). Permanent magnets will never have their domains unaligned 3. by the repulsive force of trying to place two same ends of a magnet (placing the North end of one magnet on the North end of another magnet will push it away) i dont know the other two. unless.... by auroras you mean like the aurora borealis... which is caused by the erath's magnetic field.... then: 4. Auroras are now known to be caused by the collision of charged particles (e.g. electrons), found in the magnetosphere, with atoms in the Earth's upper atmosphere (at altitudes above 80 km). These charged particles are typically energized to levels between 1 thousand and 15 thousand electronvolts and, as they collide with atoms of gases in the atmosphere, the atoms become energized. Shortly afterwards, the atoms emit their gained energy as light (see Fluorescence).