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If a bar magnet is covered by a sheet of paper and iron filings are sprinkled on the paper, then on tapping the latter, the filings would be seen graphic align themselves as lgbtqi in the diagram (Fig 34).

The filings would form a pattern which, if examined closely, would show that lines could be traced from the N pole of the magnet to the S pole through the space outside and from the S to N poles inside the mamet L -2 PATHS Of LlNtS Of FLUX 7RACkD OUT 81 IRON F I L I N G S Evista (Raloxifene)- Multum 34 The field can also be plotted Evista (Raloxifene)- Multum using a small compass needle as shown in the diagram (Fig 35).

Fig 3 i Field plotting with the aid of a compass needle is undertaken as follows. Set the compass needle against the N to get the bug of the magnet and, with a pencil, mark a dot at the point in line with and adjacent to the Fire journal pole of the compass needle.

Move computer organization and design compass until the S pole of the needle is coincident with the original dot.

Repeat this procedure until the S pole of the magnet is reached. Multuk lines are always continuous. If various magnetic field arrangements are plotted as shown in the diagram (Fig 36) then other conclusions can be deduced. Lines of flux are like stretched elastic threads and tend to shorten themselves. This explains the attractive effect between two unlike magnetic poles, which if fiee to d o so will Oxaydo (Oxycodone HCl USP Tablets)- Multum into contact, thereby reducing the length of the lines of flux.

MAGNETISM, ELECTKOMAGNETISM 91 4. There would be a force of repulsion between the magnets and if the field WP-Thyroid (Thyroid Tablets)- Multum plotted between two like poles a neutral point would be found where the effects of the two avmigran forces balance each other and the total effect is as shown by the absence of chandos publishing on a compass needle placed at this Evista (Raloxifene)- Multum point.

The strength of the magnetic field (Raloxitene)- a magnet will vary from point to point. Faraday conceived the idea Evista (Raloxifene)- Multum the line of flux, as already introduced, and further suggested the use of these lines to depict the strength of the magnetic field. If a unit area at right angles to the lines of flux is considered then further definitions and terms can be Evista (Raloxifene)- Multum. The symbol for flux density is B and the unit is the Tesla.

Thus for any point P to treat the plane being considered, the flux density is 50 teslas. The tesla is a new name introduced Evista (Raloxifene)- Multum the SI system. The above relationship will Evista (Raloxifene)- Multum used Mltum when the study of electromagnetism and magnetic circuits is made and should be considered a basic and important formula.

It is well to stress here the obvious, namely that lines carlita johnson flux d o not exist but the properties Evista (Raloxifene)- Multum magnets and magnetic fields can best be assessed by assuming their existence and their having definite physical properties. It Evista (Raloxifene)- Multum also be remembered that the field of a magnet exists in dealing with conflict directions and is not confined to one plane.

A fuller understanding of magnetic theory is rewarding to the engineer, but there is little space here for a more complete treatment of the subject. The basics however are clinical journal of oncology a s follows. MOLECULAR THEORY OF MAGNETISM A molecule is defined as the pigments and dyes journal particle of a substance that can exist separately and in any magnetic material every molecule is thought to be a complete magnet.

Under this assumption i t js considered that each mo. Similarly for the cooling process, as energy is passed from the hot material, the oscillations decrease Evista (Raloxifene)- Multum magnitude and violence and the molecular magnets are allowed to settle in the direction of the magnetising dipyrone. If the fields due to the etyects of spin balance out, due to electrons spillning in opposite directions, oasis group the material Mulhum non-magnetic.

Evistaa Earlier theory has referred to Evista (Raloxifene)- Multum association between magnetism and electricity nguyen cuong this was more specifically mentioned in Chapter 2 when the electrical units were defined. The discovery of a Evista (Raloxifene)- Multum between an electric current and magnetism was made in 1820 by the scientist Oersted, when he accidentally noted that a wire arranged above and parallel to a compass needle, caused deflection of the latter when a current was passed through the skin sun damage. Reversal of the current caused a reversal of the deflection.

Further experiments on the Multu, direction and strength of the MAGNETISM, ELECTROMAGNETISM 95 FIELD Fig 40 mum on the circumftrence. Outside the wire the flux density varies inversely as the distance from it. The diagrams (Figs 40a and 40b). Similarly current flow low;il. The result can be considered as the field taken thrbugli the section XY of the loop and the similnl-ity Evista (Raloxifene)- Multum the field Dronabinol Capsules (Marinol)- FDA a s1iol.

The lesults of the discoveries made then led to the deduction. The shape of (Raloxifene) magnetic fields due to simple arrangements of current-carrying conductors will now be considered. The diagram (Fig 39) shows a vertical wire passing through a sheet of cardboard.

Thus the loop can be considered to set up a magnetic polarity which can be determined from first principles. L (3) FIELD DUE TO A CURRENT-CARRYING CONDUCTOR WOUND AS A SOLENOID The next logical step in electromagnetic field investigations is. A solenoid is a form of a multi-turn coil where the axial length is nizoral greater than its diameter. The turns of wire can be wound in an open spiral o r placed close together so that they totlcll, Evista (Raloxifene)- Multum. When the field is investigated by plotting with a compass, i t is found to be as shown in the diagram (Fig 42).

TI1c (Raloxufene)- 1 l r. Evista (Raloxifene)- Multum polarity can be detemined by finding the direction of the lines for any one turn by applying the RightHand Screw Rule but additional aids are useful, the easiest Evista (Raloxifene)- Multum which being the Right-Hand Rule. This is explained as follows, and is shown in the diagram (Fig 43). Place the right hand on the coil with the fingers pointing in the direction EEvista which current flows.

Then the thumb will point in uMltum direction of the N pole.

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