Ch 13 Flashcards
Electristatics
The study of charges at rest
Electrostatic induction
Whenever a charges body is brought closer to insulated conductor the near end develops unlike charge and far end developes like charge this separation
Electrostatic induction
Whenever a charges body is brought closer to insulated conductor the near end develops unlike charge and far end developes like charge this separation
Electroscope
Detecting charges
Brass rod with a brass disk at top and two thin leaves at bottom of
Coulombs law
The force of attraction or repulsion between two point charges is directly proportional to product of magnitude of charges and inversely proportional to square of distance between them
F=kq1q2/r²
Electric field
Region around a charge in which it exerts electrostatics force on another charge
Field intensity
At any point defined as the force acting on unit positive charge placed at that point
Nc-¹
E=f/qò
Field lies
Direction of electric field intensity can be represented by drawing lines
Electric potential
At a point in an electric field is equal to the amount of work done in bringing a unit positive from infinity to that point
V=w/q
Volt JC-¹
Volt
If one joule of work is done against the electric field in bringing one coulomb of positive charge from infinity to a point then potential at that point will be one volt
Potential difference
The energy supplied by a unit charge as it moves from one point to the other in the direction of field
q(Va-Vb)
Potential difference
The energy supplied by a unit charge as it moves from one point to the other in the direction of field
q(Va-Vb)
Capacitor
In order to store charge this device is used
Capacitance
Ability of the capacitor to store charge
C=q/v
Farad
If one coulomb of charge given to the plates produces a potential difference of one volt then it’s capacitance will be one farad
Parallel capacitor
Same potential difference
Charges different due to different capacitance
Total charge divided
Equivalent capacitor q=C1+C2+C3
Series capacitor
Same charge
Potential difference
Voltage divided
Equivalent capacitor C=1/C1+1/C2+1/C3
Electrolytic capacitor
Capacitors that uses chemical reactions
Fixed capacitor
Capacitance who’s capacitance does not change
Large number of plates is piled up one over other with layers of dielectric in between
Variable capacitor
Some arrangement is made to change the area of plates facing each other
Turning the rotatable plates in or out of space between the static plates
Lightning
The charge in cloud jumps to the ground with a violent spark and explosion
It occurs due to large quantity of electric charge which build up in the heavy thunderclouds
Lightning
The charge in cloud jumps to the ground with a violent spark and explosion
It occurs due to large quantity of electric charge which build up in the heavy thunderclouds
