The average speed of electrons flowing though the filament of a dc flashlight bulb is
A) about the same speed as sound in metals.
B) dependent on how quickly electrons bumps into one another.
C) the speed of light.
D) 1000 cm/s.
E) a snail's pace of less than 1 cm/s.
Answer: E
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A conducting bar moves as shown near a long wire carrying a constant 80-A current. If a = 1.0 mm, b = 20 mm, and v = 5.0 m/s, what is the potential difference, Va ? Vb?
a.
?0.24 mV
b.
+0.24 mV
c.
?0.19 mV
d.
+0.19 mV
e.
?0.76 mV
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