# Examples in Magnetism

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### Contents

 Section 1 11 Section 2 42

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Page 9 - The Pythagorean theorem states that in any right triangle the square of the longest side (hypotenuse) is equal to the sum of the squares of the other two sides.
Page 53 - The derivative of the sine of an angle is equal to the cosine of the angle times the derivative of the angle.
Page 58 - At a place where the horizontal component of the earth's field is 0.18 units, a bar magnet 8 cm.
Page 41 - All metals, iron excepted, wood, glass, fire, water, and animal bodies, give a free passage to the magnetic fluid, and do not prevent its acting upon iron. They discovered that the north pole of one magnet attracts the south pole of the other, and that the north pole of one repels the north pole of the other, and the south poles applied together also repel each other.
Page 75 - ... pole N induces a south pole at A, and the effect of this at any point P of the magnet is opposite and nearly equal to that of the original north pole. In the case of a horse-shoe magnet a single piece of soft iron is placed across the poles, and the same effect is produced. We have already seen that when a piece of soft iron is placed in a magnetic field the lines of force are concentrated through the iron. When a single bar magnet is alone lines of force diverge from its north pole, and pass...
Page 62 - point" charge is a physical impossibility, since its mass would be infinite. EXAMPLES, CHAPTER III 1 . A motor car is travelling at 300 mph in a westerly direction (at right angles to the magnetic meridian) at a place where the horizontal component of the earth's magnetic field is 2 x 10~5 weber per sq.
Page 22 - The unit of force in the cgs system is called the dyne and follows from the gram by the equation F=ma.
Page 54 - ... if the horizontal component of the earth's magnetic field is 0.2 gauss, and the force of gravity is 980 dynes; the length of the magnet being 10 cms.
Page 55 - ... if the value of the horizontal component of the earth's field is fy gauss, and the force of gravity equal to 980 dynes.
Page 25 - Then the turning effort, or the turning moment, or simply, the moment, is the product of the force times the perpendicular distance to the axis :' rotation; or expressed in symbols; T = FX / This is illustrated in Figure 7.