Ph-204 Chap 20

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Author:
Allistermark
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197915
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Ph-204 Chap 20
Updated:
2013-02-16 23:31:01
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Electric Magnetic fields 20
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Description:
Electric and Magnetic Fields and forces.
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  1. Matter with equal amounts of positive and negative charge is:
    neutral
  2. The fundamental charge e is:
    The magnitude of the charge on an electron or proton: 

    e = 1.60x10-19C
  3. Atoms consist of:
    A Nucleus containing positively charged protons surrounded by a cloud of negatively charged electrons.
  4. There are two kinds of charge:
    • 1. Protons (+) 
    • 2. Electrons (-)
  5. Charge is conserved; means?
    It cannot be created or destroyed.
  6. Where does the electric field exists?
    At all points in space.
  7. A Field Diagram shows:
    field vectors at several points.
  8. Electric field lines:
    • 1.are always parallel to the field vectors.
    • 2.are close where the field is strong, far apart where the field is weak. 
    • 3.go from positive to negative charges.
  9. There are two types of materials:
    • 1.Insulators. 
    • 2.Conductors.
  10. How does charge behave on an insulator?
    Charge remains fixed on an insulator.
  11. How does charge behave on a conductor?
    Charge moves easily through conductors.
  12. Charge is transferred by:
    contact between objects.
  13. A Dipole:
    Has not net charge, but has a field because the two charges are separated.  (a dipole will rotate to align with an electric field.)
  14. The electric field inside a Parallel-plate capacitor is:
    uniform.
  15. Conductors in electric fields:
    • 1.The electric field inside a conductor in Electrostatic equilibrium is zero. 
    • 2.Any excess charge is on the surface. 
    • 3.The electric field is perpendicular to the surface. 
    • 4.The density of charge and the electric field are highest near a pointed end.
  16. Direction:
    The forces are directed along the line joining the two particles. The forces are repulsive for two like charges, and attractive for two opposite charges.
  17. Coulomb's Law:
    • Magnitude: if two charged particles having charges q1 and q2 are a distance r apart the particles exert forces on each other of magnitude    F1on2 = F2on1 = Kq1q2  where the charges are in Coulombs (C), and K=8.99x109N*m2/C2
    • These forces are an action/reaction pair, equal in magnitude and opposite in direction.
  18. Reading Quiz: 
    A negatively charged rod is brought near a neutral charged sphere. What can be assumed will happen to the sphere?
    Ans: There is an attractive force between the rod and the sphere.
  19. Reading Quiz: 
    The field inside a charged parallel plate capacitor is?
    Ans: Uniform.
  20. Reading Quiz: The electric field inside a metallic conductor is:
    Ans: Zero
  21. 1. What is Charging.
    Ans: Frictional forces, such as rubbing, add something called charge to an object or remove it from the object. More vigorous rubbing produces a larger quantity of charge.
  22. Two objects with like charge (+/+ or -/-) exert what electric force in relation to each other?
    Repulsive electric force.
  23. What is a "Long-range force?
    It is the force between two charged objects. The magnitude of the force increases as the quantity of charge increases and decreases as the distance between the charges increases.
  24. Neutral objects have:
    an equal mixture of positive and negative force.
  25. The rubbing process charges the objects by:
    transferring charge, usually negative, from one to another.  The objects acquire equal but opposite charges.
  26. Charge is conserved:
    It cannot be created or destroyed.
  27. There are two types of materials:
    • 1.Conductors: materials through or along which charge easily moves. 
    • 2.Insulators: materials on or in which charges remain fixed in place.
  28. Charge can be transferred from one object to another by?
    Ans: Contact.
  29. The electrostatic constant:
    K=8.99x109N*m2/C2

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