Chapt. 31
Faraday’s Law of Induction and Inductors
241
b) Just for a moment let’s speak generally. What is the formula for magnitude of the magnetic
flux Φ for a uniform magnetic field of magnitude
B
over a surface area
A
perpendicular to
the magnetic field direction? Now returning to our system of interest, what is the formula
vextendsingle
vextendsingle
vextendsingle
vextendsingle
d
Φ
dt
vextendsingle
vextendsingle
vextendsingle
vextendsingle
for our system in terms of
B
,
v
, and
ℓ
?
c) What is the numerical value of the current through resistor
R
1
and what is its direction?
What is the numerical value of the current through resistor
R
2
and what is its direction?
What is the numerical value of the current through the bar and what is its direction?
Indicate the directions on the diagram.
d) What is the numerical value of the total power delivered to the circuit resistance?
e) What is the applied force that must be exerted on the bar by an outside source to keep the
bar moving at a constant velocity? This force points in the direction of motion. There are
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 Fall '06
 Buchler
 Physics, Angular Momentum, Frequency, Electrical generator

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