ELECTROMAGNETIC FIELD This is a field representing the joint interaction of electric and magnetic forces. It is exerted on charged particles. The force on a charge q moving with velocity v less than the velocity of light is given by F = q (E + v x B) A conductor carrying an electric current when […]
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DEFINITION AND CONCEPT Electromagnetic waves are produced by electromagnetic vibrations. Electromagnetic waves have electrical origin and the ability to travel in vacuum. So, electromagnetic waves are regarded as a combination of traveling electric and magnetic forces which vary in value and are directed at right angles to each other and to the direction of travel.
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INTRODUCTION Gravitational field is a region or space around a mass in which the gravitational force of the mass can be felt. Gravitation is the force of attraction exerted by a body on all other bodies in the universe. Gravitational force act between all masses and hold together planets, stars and galaxies. Each mass has
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An electric field is a region of space which surrounds a system of electric charges. Electrical forces will act on any electric charge which is placed within the region. Electric field is a vector quantity. The direction of the filed can be determined using a test charge (a small positive charge) Fundamental Law of Electrostatics
RESISTIVITY AND CONDUCTIVITY The resistance of a wire maintain at a constant temperature is related to its length L and its cross-sectional area (A) by the expression R = ρl A Where ρ is a constant known as resistivity of the material (its unit is ohm-metre, Ωm) ρ = RA l R = resistance, A
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DEFINITION OF SIMPLE TERMS Electrolysis – Is the process whereby a liquid conducts electricity by the movement of positive and negative ions within the liquid while undergoing chemical changes. Electrolytes – Are liquid, which allows the electricity through them is called electrolytes. Such electricity is salt solutions, alkalis and dilute acids (acidulated water). Non-Electrolytes –
ELECTRIC CIRCUIT Electric current is simply electric charge in motion. Electric cells are chemical devices, which are capable of causing an electric current to flow. This produces electric force, which pushes the current along. Electrons flow from the negative terminal or cathode of the cell to the positive terminal or anode TYPES OF ELECTRIC CELLS
PATTERNS OF MAGNETIC FIELDS Magnetic field pattern can easily be observed using iron fillings. The magnetic is put on paper and the iron fillings are sprinkled lightly on the paper around the magnet. The paper is tapped gently and the iron fillings are found to turn and set to in definite direction. MAGNETIC FIELD AROUND
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MAGNET AND ITS PROPERTIES A magnet is any material that is capable of attracting other pieces of the same material as well as pieces of iron. A substance is said to be ferromagnetic if it is attracted by a magnet. Examples are iron, cobalt, Nickel, and certain alloys. Substances which cannot be attracted by a