Electric Charge

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Electric Charge
2012-01-25 18:45:46
electric physics flux static force charge

Physics 202, Chapter 19: Electric Charges, Forces, and Fields
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  1. Which is stronger, electric or gravitational forces? By what factor?
    Electric force is greater than gravitational force by a factor of 2.26 * 1039.
  2. What is the magnitude of an electron's charge, e?
    e = 1.60 * 10-19 C
  3. What is the mass of an electron?
    me = 9.1 * 10-31 kg
  4. What is the mass of a proton?
    mp = 1.673 * 10-27 kg
  5. What is the mass of a neutron?
    mn = 1.675 * 10-27 kg
  6. What does it mean to say that electric charge is quantized?
    All objects have a net charge that is an integral multiple of e. You can't have a portion of a charge, it must be a whole number.
  7. How does a material act if it is a photoconductor? What is an example of a photoconductive material?
    The material's electric properties, i.e. if it is an insulator or a conductor, is determined when the given material is exposed to light.

  8. What is Coulomb's Law?
    The magnitude of the electrostatic forces between two point charges is proportional to the product of the magnitude of these charges.

  9. What is the proportionality constant k?
    k = 8.99 * 109 Nm2/C2
  10. How does the Law of Superposition apply to electric forces?
    Since electric forces are vector quantities, the net force on any charge is the vector sum of the forces taken individually.

    F1 = F12 + F13 + F14