Electricity Flashcards
Means of charging
By friction ( tribo electric effect)
By conduction
By induction
Charging by friction involves
Rubbing
What is positive charge?
Charge that resembles the charge acquired by a glass rod rubbed with silk cloth
What is negative charge?
Charge that resembles the charge acquired by an ebonite rod rubbed with fur
How does current flow in conductors?
Current flows by movement of electrons, they have a large conc of charge carriers
Number density
Charge per unit volume
Electrons move from __________________ to __________________
Lower potential to higher potential
Conduction results in
Charges with similar charges
Followed by repulsion
Conduction
Involves electrical contact
Direction of flow determined by potential difference
Positive charge is assumed to flow from higher potential to lower potential
Conduction followed by repulsion
Earthing is a case is conductance
Induction involves electrical contact. True or false
False
INDUCTION DOES NOT INVOLVE ELECTRICAL CONTACT
IT CAN CHARGE INSULATORS, CONDUCTORS, POLAR DIELECTRICS, NON POLAR DIELECTRICS
Induction involves
No electrical contact
Aka electrostatic induction
Temporary process
Charge any type of material
Charges that appear due to ends of body are induced charges
Induction followed by attraction
Similar charges at the opposite end
Body becomes heterogenous,y neutral
Sure test for electrification is
Repulsion
Since attraction can be between a charged body and neutral body due to INDUCTION
Electrostatic force is
Directly proportional to product of magnitudes of both charges and
Inversely proportional to square of distance between them
Electroscope
Detects the presence of charge
Value of K
9 x 10^9 Nm^2_C^2
