Physics Concepts

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Physics Concepts
2011-08-09 13:18:24

Some Physic Concepts
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  1. Electricity: 45
    Coulomb's Law: the force of attraction or repulsion between two points charges is directly proportional to the product of the two charges and inversely proportional to the square of the separation between the charges.
  2. Electricity: 46
    Use the sign of the charges to determine the direction of the forces and Coulomb's Law to determine their magnitudes
  3. Electricity: 47
    Electric forces and electric fields are vectors, electric potentials are scalars.
  4. Electricity: 48
    Electric fields point in the direction of the force on a positive test charge.
  5. Electricity: 49
    The electric field inside a closed conductor is zero. Outside the conductor the electric field is not zero and the electric field lines are drawn perpendicular to the surface.
  6. Electricity: 50
    Electric field lines are perpendicular to equipotential to the surface.
  7. Electricity: 51
    Electric fields between two parallel plates are uniform in strength except at the edges.
  8. Electricity: 52
    The electric potential energy increases as a positive charge is moved against the electric field, and it decreases as a negative charge is moved against the same field.
  9. Electricity: 53
    The energy gained by a charged particle that is accelerated through a potential difference can be expressed in elctronvolts (eV). (1 eV=1.6x10-19J)
  10. Electricty: 54
    The electric potential (V) is equal to the work per unit charge.
  11. Electricity: 55
    No work is done in moving a charged object along an equipotential line.
  12. Electricity: 56
    Capacitance is the ratio of charge to the potential for a given conductor.
  13. Electricity: 57
    The capacitance for a parallel-plate capacitor depends on the surface area of each plate, the plate separation and the permittvity or dielectric constant.