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Static Electricity by Liu Yao (17) 4S3 by Mind Map: Static Electricity by Liu Yao (17)
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Static Electricity by Liu Yao (17) 4S3

Principles of electrostatics

charging by rubbing

charging by induction

induction is the production of electric charge on the surface of a conductor under the influence of an electric field

earthing process

crazy action of paper

attractive force>repulsion force

Laws of electrostatics

electrically charged

negatively charged, amber(rubbed by fur), rubber(rubbed by fur), polythene(rubbed by wool)

positively charged, glass(rubbed by silk), perspex(rubbed by wool)

like charges repel and unlike charges attract

SI unit coulomb(c)

Hazards and Application of Electrostatics


laser printer

electrostatic paint spraying

electrostatic precipitator

Electric Field

electric field lines

the lines must begin from positive charges and end on the negative charges

the number of lines drawn leaving a positive charge or ending on a negative charge is proportional to the magnitude of the charge.

no two field lines can cross each other

the electric field between parallel oppositely charged plates is uniform at the central region

the electric lines of force are closer to each other in a stronger electric field