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Capacitors and capacitance

physics Secondary

ELECTRIC FIELD

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 The fundamental law of electrostatic states that: “Like charge repels, unlike charges attract. COULOMB’S LAW Coulomb’s law states that the force between two point charges is proportional to the product of their charges and inversely proportional to the square of the distance between them. Mathematically, F α q1q2 r2 F =k q1q2 r2 Where k = 1 = 8.99×109 4πɛ◦ Thus, F = q1q2 4πɛ◦r2   ELECTRIC FIELD INTENSITY OR STRENGTH (E) The electric field intensity, E, at any point in an electric field is the force experienced by a unit positive test charge at… Read More »ELECTRIC FIELD

Physics

ELECTROSTATICS

Electric fields An electric field is the space around a charged body where another charged body would be acted on by a force. These fields are represented by lines of force. This line of force also called an electric flux line points in the direction of the force.   Electric field patterns Just like in magnetic fields, the closeness of the electric field-lines of force is the measure of the field strength. Their direction is always from the north or positive to the south or negative.   Charge distribution on conductors’ surface A proof plane is used to determine charge distribution on spherical or pear-shaped conductors. For an isolated sphere it is found that the effect is the same for all points on the surface meaning that the charge is evenly distributed on all points on the spherical surface. For appear-shaped conductor the charge is found to be denser in… Read More »ELECTROSTATICS

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