#Frm notes 2019 pdf Patch
#Frm notes 2019 pdf tv
#Frm notes 2019 pdf download

Moments of a force = Force Г— perpendicular distance from pivot. The moment of a force about a point is the product of the force applied and the perpendicular distance from the pivot (or turning point) to the line of action of the force. The turning effect produced depends on both the size of the force and the distance from the pivot. The turning effect of a body is called the moment of that force. (The thickness of the oil film is called upper limit to the size of molecule because the moleculeД¬annot be bigger than the thickness of the oil film) Thickness of the oil film = volume / area, hence 0.10 / 31,400 = 3.0 Г— 10-6 mm. Suppose an oil drop has a volume of 0.10 mm 3 and forms a film with a radius of 10 cm.Д¬alculate, the thickness of the oil film.

#Frm notes 2019 pdf Patch

Thickness of the oil patch = volume / area

Volume = area Г— thickness of the patch, therefore The oil spread and formed a patch of area 6.0 Г— 104 mm 2. A drop of olive oil, whose volume is 0.12 mm 3, was placed on a surface of clean water. 32 mm Adding up the two we get 4.32 mm.Д«oth the volume and area of a drop can be calculated using the following formulasДЎ. Sleeve scale reading вЂ“ 4.0 mm Thimble scale reading - 0. This method is known as single-stroke method.Д¬) Magnetizing using an electric current вЂ“ this is the use of magnetic effect of an electric current through a solenoid (insulated wire of many turns).

This is repeated several times and the object becomes magnetized. Materials like iron lose their magnetism easily and are said to be soft while others like steel gain magnetism slowly but retain it longer and are therefore said to be hard and are used to make permanent magnets.Д«) Magnetizing by stroking вЂ“ the object to be magnetized is placed on a bench then a bar magnet is dragged along the length of the bar from one end to the other. The following are methods used to make magnets.ДЄ) Magnetic induction вЂ“ this is a process by which magnets are made by placingДЇerromagnetic materials in a magnetic field.

#Frm notes 2019 pdf tv

Watches (non-digital), electron beams in cathode ray tubes and TV sets are shielded from external magnetic fields by placing a soft-iron cylinder around the neck of the tube or watch. The points marked вЂXвЂ™ are called neutral points where there is no magnetic field at such points. Their closeness is a measure of the strength of the magnetic field or of the force that would be exerted by the bar magnet. Magnetic field is the space around a magnet where magnetic field (force) is observed.ДЄ line of force gives the direction of the magnetic field at each point along it. The greatest magnetic force is concentrated around the poles of a magnet. Repulsion is a sure method of determining whether two substances are magnets.ДЈ. Like poles repel and unlike poles attract. They are double poled substances with both the North and South poles.Дў. The materials that are so lightly attracted such that the magnet seems to have no effect on them are called paramagnetic materials (mostly non-magnetic materials).ДЇerrites are a mixture of iron oxide and barium oxide are the most newly developed magnetic materials.Д¬eramic magnets or magnadur magnets are made from ferrites and are very strong.ДЎ. iron, nickel, cobalt are called ferromagnetic materials. Substances that are repelled by magnets are said to be diamagnetic whereas those which are strongly attracted i.e. Iron, steel, cobalt and nickel are magnetic substances, while wood, glass and copper are examples of non-magnetic substances. Ones are those that are not affected by magnets. Magnetic materials are those that are strongly attracted by magnets while non-magnetic Other magnets produced artificially by man are called artificia l magnets. Natural magnet which was discovered by the Chinese 2,000 years ago. Magnets are substances that are able to attract and hold items.

#Frm notes 2019 pdf download

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