Magnetic fieldlines on a hor12/24/2023 ![]() Direction of Magnetic field is determined by corkscrew method Īmpere’s Law Used to determine the magnetic field yielded by current-carrying wire Ampere’s law states that the product B and length of line segment around any closed path equals µ 0 times the net current through the area enclosed by the path. 27.17Īpplications of motion of charged particles Velocity Selector Particles of a specific speed can be selected from the beam using an arrangement of electric and magnetic fields called a velocity selector. Motion of charged particles in a magnetic field Fig. ![]() Motion of charged particles in a magnetic field Magnetic Force on Moving Charge The magnetic force is always perpendicular to v a particle moving under the action of a magnetic field alone moves with a constant speed. Grip and Hand Rules Out of the Page In to the Page Magnetic Force on Moving Charge Moving charged particles are deflected in magnetic fields Right-Hand Rule Units of Magnetic Fields SI units: tesla, T 1 tesla = 1 T = 1 N/A The magnetic force F m acting on a positive charge q moving with velocity v is perpendicular to both F m and the magnetic field B. Magnetic interactions can be described as: A moving charge or a current creates a magnetic field in the surrounding space (in addition to its electric field) The magnetic field exerts a force F m on any other moving charge or current that is present in the field. Magnetic Force Like poles repel, opposite attract An object that contains iron but is not itself magnetized is attracted by either pole of a permanent magnet. Or "charge" the blob of putty so it can become a magnet of its own and pick up small tacks and paperclips.Magnetic Fields A force field that denotes the area in which the non-contact force of permanent magnets or current carrying conductors can exert their influence Fields are concentrated at the poles Same properties with Electric field lines except that there is no magnetic monopole Use the included super-strong ceramic magnet to control the putty like a snake charmer. This material has millions of tiny micron-sized magnets that are embedded in each handful of thinking putty. Now ferrofluids are used to make rotating seals in high vacuum equipment and can be even found in high-end speakers. Ferrofluid, a colloid with magnetic nanoparticles suspended in an oil base, was originally discovered by NASA scientists. As the magnet comes closer to the ferrofluid, spikes begin to rise from it. Neodymium is one of the most powerful magnet materials of the world and has high resistance to demagnization.įerrofluid is an incredible substance which is in liquid form until a strong magnetic field is brought near it. Each has cross sectional planes with compass needles that shows the direction of the magnets field lines. One is the pole magnet and the other is a horseshoe magnet. Two type of magnets is used for this demo. This demonstrates the three dimensional field line of a magnetic bar. The demonstrator can open down the center, making it possible to view the magnetic field from all angles.Ĭlick here to see a video clip of this demo. This clear plastic case makes it possible to observe a magnetic field in 3-D.Each side of the field demonstrator contains iron filings, and the center of the demonstrator houses a powerful magnet. MG.1(2b) - 3-D Magnetic Field Demonstrator When the magnetic bar is inserted, the iron powder will show the magnetic field lines inside the cube due to the magnetic bar. ![]() A hole in the middle of the cube allows us to insert a magnetic bar. The iron powder can move freely in the cube. The three dimensional cube contains some liquid and iron powders in it. This experiment demonstrates the three dimensional field lines of a magnetic bar. The iron fillings align themselves with the magnetic field. Place the permanent magnets under a thin plexiglas's plate (to avoid having the iron fillings stuck to the magnets nor to the projector) and sprinkle iron fillings lightly. It is clear and easily visible by the whole class when done on the overhead projector. The magnetic lines of force of a bar magnet and a horse-shoe magnet can be shown by sprinkling iron fillings over them.
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