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Phys 135B: College Physics II
Midterm 2 Solutions
Be neat and show all work to get full credit
1- What is the current in amperes if 1200 Na
+
ions flow across a cell membrane in 3.5 ?s? The charge on
the sodium is the same as on an electron, but positive.
2-) A hair dryer draws 7.5 A when plugged into a 120-V line. (a) What is its resistance? (b) How much
charge passes through it in 15 min? (Assume direct current.)
(a) .
(b)
3-
(a) In the circuit below, if the load resistor is 1 ?,
what terminal voltage will the battery provide?
.
(b) In the circuit below, find the equivalent
resistance between points A and B.
4- A heater coil connected to a 240-V
r m s
ac line has a resistance of 34 ? (a) What is the peak current? (b)
What is the average power used? (c) What are the maximum and minimum values of the instantaneous
power?
(a)
(b)
(c) (or
5- A rectangular solid made of carbon (? = 1.68x10
-8
?-m ) has...

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