Exam 1Quiz 1Quiz 2

1
Exam 1 Quiz 1 Quiz 2
75 ? 12
Avg score
8 ? 2
6 ? 2
Single most common score
75
10
5
For most of you, your current quiz average
and exam average are exactly the same
For those of you for whom that is not true,
remember the 4 quiz grades together
are equal in weight to 1 unit exam. Each quiz is
just ¼ of 1/7th of your final grade.
You can determine where you stand by a simple
average (all equal in weight) of
your reci grade, lab grade, 1st exam, and quiz
average.
2
A copper coil is set just behind the wire loop
of this circuit.
As the switch is closed,

• a clockwise current is induced in the copper
  loop.
  
• a counter clockwise current is induced in the
  copper loop.
  
• no current appears in the copper loop.

3
A copper coil rests flat on a tabletop next to
the wire loop of this simple circuit. As the swi
tch is opened,

• a clockwise current is induced in the copper
  loop.
  
• a counter clockwise current is induced in the
  copper loop.
  
• no current appears in the copper loop.

4
A copper coil is set just behind the wire loop
of this circuit.
As the switch is opened,

• a clockwise current is induced in the copper
  loop.
  
• a counter clockwise current is induced in the
  copper loop.
  
• no current appears in the copper loop.

5
2) a counter clockwise current is induced in the
copper loop. A clockwise current is created in th
e black wire loop, establishing a sudden
magnetic field pointing down into the center of
the copper coil. To counter this, the coil will
try to create a field of its own pointing out.
It does this with a counter clockwise current.
2) a counter clockwise current is induced in the
copper loop. While current flows the wire loops
field points into the screen within its center,
but doubles back outside the loop. That means w
here the copper coil lies, the field initially
points out. When the switch is opened, this
field suddenly vanishes. To counter the
disappearance of flux, the coil tried to create
its own, which requires a clockwise
induced current. 1) a clockwise current is indu
ced in the copper loop. The coil tried to replace
the flux that starts to disappear as soon as the
switch is opened.