Midterm
Name:
ID:
k
1
k
1

(8 points each question)
1.
Charge Q1 of
is placed 1 meter away from charge Q2 of
. The quantity k is
8.99×10
9
Nm
2
/C
2
, the constant in Coulomb’s Law.
What is the force on Q2?
1.
State Gauss’s Law and Ampere’s Law in your own language and write out the
formulas.
1.
State Faraday’s Law of induction and write out the formula, and state Lentz Law in
your own language.
1.
A high voltage generator is made of a metal sphere with a radius of 6 cm sits on an
insulating post. A wire connects to the sphere’s inner surface through a small hole.
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 sphere assuming potential far away from the sphere is zero?
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
H
is
generated through the wire every second. When the wire is stretched to twice its
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 Spring '08
 Ye
 Charge, Magnetism, Force, Magnetic Field, Electric charge, Lentz Law, twisted wire pair

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