Introduction to electrostatics, Slides of Electronics

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ELECTROSTATICS

ELECTROSTATICS

• (^) If a plastic pen is

rubbed on the wool it

will attract dust and

small pieces of paper.

• (^) You may feel a shock

after walking on a

woolen carpet and

• (^) An annoying shock is sometimes

experienced when you touch the

door handle of an automobile after

sliding over the plastic–covered

Like charges repel, unlike charges attract

each other

ELECTRIFICATION

• (^) Electrification is the process of establishing an electric charge on an object.
• (^) A. ELECTRIFICATION BY FRICTION
• (^) B. CHARGING BY CONDUCTION
• (^) C. CHARGING BY INDUCTION

B. CHARGING BY CONDUCTION

• (^) If a charged material is touched to a neutral or another charged

object, what happens?

• (^) The sign of charge on both objects is the same and they share total

electrical charge according to their volume.

• (^) The charge of each sphere is

NOTE

Grounding application in daily life

• Mosque minarets or conductive rods at the ends of high buildings, called lightning rods, are systems that are grounded with a copper strip.
• (^) The factories producing cars make use of static electricity in painting cars. For this purpose the body of the car and the paint are charged with opposite charges so that the point covers the car.

FARADAY CAGE

• (^) Faraday cage prevents electrical effect the ingress or egress.
• (^) Faraday cages are named after the English scientist Michael Faraday, who invented them in 1836.
• (^) A Faraday cage operates because an external static electrical field causes the electric charges within the cage’s conducting material to be distributed such that they cancel the field’s effect in the cage’s interior. This phenomenon is used, for example, to protect electronic equipment from lightning strikes and electrostatic discharges. Faraday cage is used on microwave oven and lift cabin