Electostatics

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Electostatics

  1. 1.  Is the study of charged particles at rest.Two types of charges: 1.Positive Charge 2.Negative Charge
  2. 2. POSITIVE CHARGES  Proton  Electric lines of force is outward.  Charge : +1.6 x 10-19 C
  3. 3. NEGATIVE CHARGES  Neutron  Eclectic lines of force is inward.  Charge : -1.6 x 10-19 C
  4. 4. Two Laws of Charges: • Unlike Charges  Attract • Like Charges  Repel
  5. 5. Field Lines between opposite charged parallel plates** Field between plates is uniform **
  6. 6. When two different bodies are rubbedagainst each other, the electronsare simplytransferred from one body to another. No electron is destroyed nor createdOne body acquires a positive charge andanother body acquires an equal but negativecharge. Mathematically, we can state that thesum of positive and negativecharges duringthe process of rubbing is zero.
  7. 7. Is a material which allows charges to flow readily. Metals are good conductors becausethey have plenty of free electrons that moveabout the material Is a material that resists the flow of charges.  Rubbers, plastic, mica, paper, glass and air are insulators.
  8. 8. 1. Conduction is charging by contact between the neutralbody and the charging body.2. Induction  does not involve contact between theneutral body and the charging body.
  9. 9. 3. Rubbing If two objects are rubbed together, especially if the objects are insulators and surrounding air is dry,the objects acquire equal and opposite charges and anattractive force develops between them. 4. Polarization  When a negatively charged object comes near neutral object and the charges in the neutral objectsplit on two different sides of the surface with thepositive charge closer to the negatively charged object.
  10. 10.  is a device for determiningthe kind of chargeof a body.  may be chargedeither by conduction orinduction.
  11. 11.  Charles Augustin de Coulomb F=k q1 q2 d2Where: q1 and q2 are the magnitudes of the charge d is the distance F is the electric force k is the Coulomb constant ( 9 x 10 9 Nm2/c2 )
  12. 12. region in space where electricforces act on charges Has the property that any chargedparticle placed in it will experience anelectric force.  Vector quantity
  13. 13. Formula: E = F/qWhere:E = Electric Field Strength (N/C)q = amount of chargeF = force on charge

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