1
Physics 4B
SECOND EXAM
Chapters 26  28
Spring 1994
Name:_________________________________________
Solve the following problems in the space provided.
Use the back of the page if needed.
Each problem is worth
20 points.
You
must
show your work in a logical fashion starting with the correctly applied physical principles
which are on the last page.
Your score will be maximized if your work is easy to follow because partial credit will
be awarded.
1.
In the circuit at the right V=12.0V, C
1
=4.00μF and C
2
=8.00μF.
Initially
the capacitors are uncharged.
(a)Find the charge on the capacitors when switch
S
1
is closed and switch S
2
is open.
(b)Now, S
1
is opened and S
2
is closed.
The charge that was on C
1
can flow to C
2
.
Find the resulting charge on each
capacitors.
2. Two identical spheres of radius a are separated by a distance b. The
sphere on the right has a charge, +Q, and the sphere on the left has a charge,
Q.
Find (a)the electric field at a distance r from the sphere on the right along
the line that joins the spheres, (b)the potential difference between the
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 Fall '09
 Staff
 Electron, Work, Potential difference, Electric charge

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