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Midterm
Name:
ID:
k
1
(8 points each question)
1.
Calculate the electric field strength 2 meters away from charge Q of
.The
quantity k is 8.99×10
9
Nm
2
/C
2
, the constant in Coulomb’s Law.
1.
State Coulomb’s Law and Gauss’s Law in your own language and write out the
formulas.
1.
State Ohm’s Law and Faraday’s Law of induction in your own language and write out
the formulas.
1.
A solid metal sphere with a radius of 6 cm sits on an insulating post. A wire connects
to the sphere’s bottom. The wire carriers a current of 1 μA and flows into the sphere
when the switch is closed. One (1) minute after the switch is closed, what is the
electric potential at the surface of the surface assuming potential far away from the
sphere is zero. What is the electric potential inside this sphere 3 minutes after the
switch is closed?
5.
A straight wire of cross section
A
and length
L
has a resistance
R
and is connected to a
battery of emf
V
, ignore the internal resistance. A certain amount of heat
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 Spring '08
 Ye
 Charge, Magnetism

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