Download TEST I 2-12-09

Hints about exam I on Thursday 2/12/09-----I will not be able to answer emails till
Monday next week.
Please bring small blue Scranton that has 50 answers on one side. That way you all are at the
same page. Do not bring a big one. May be just bring two of these. Just in case one goes bad or
you may help someone else. Macho. Gracious
Properties of electric fields and electric lines, value of electric field at a point, Coulomb’s law
and force between an electron and a proton at a certain distance, what do symbols Lemda,
sigma and row stand for? Gauss law and when is flux Maximum and when is it minimum,
electric field inside, outside and on the surface of a conductor. Charge on a glass rod and rubber
or ebonite rod. Compare electric field generated by a proton and an electron, ratio of mass of a
proton and an electron, compare acc of a proton and an electron while placed in the same
electric field, draw graph of electric field vs distance for a charged conducting sphere, induced
charges by induction and conduction, remember surface charge density is highest at the
sharpest points of a conductor that is where radius is the smallest.
Problem: Two spheres have 20 micro coulombs of charge together. While 30 cm apart they
push with 2N force. Determine the charge on each.
Problem: One particle has a chare 20C and mass 20 grams and other at a distance of 50 cm has
a charge of -50C. If first particle is free to move from rest, what will be its initial acceleration?
Problem: A long cylinder of radius 10cm is filled with an insulator and has a uniform charge
density of 1.2 micro Coulombs per m cubed. What is the electric flux for a spherical surface of
radius 2cm that has center on the axis of a cylinder?
GOOD LUCK FOR THE TEST----Your friend
Tarlochan Dhillon