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* _ ___ 1. If R = 4.0 kΩ, C = 3.0 mF, ε = 15 V, Q = 12 mC, and I = 2.0 mA, what is the potential difference Vb −
Va? Some Difficult Problems
a.
b.
c.
d.
e. +3.0 V
−19 V
−3.0 V
+27 V
+21 V ____ 2. How many time constants must elapse if an initially charged capacitor is to discharge to 45% of its
stored energy through a resistor?
a. 0.60
b. 0.46
c. 0.52
d. 0.40
e. 1.1 ____ 3. If R1 = 3.0 Ω, R2 = 6.0 Ω, R3 = 12 Ω, and I = 0.50 A, at what rate is heat being generated in R1 ? ____ 7. A battery has an internal resistance of 4.0 Ω. Which of the following load resistors would have the most
power delivered to it when connected across the battery?
a. 1.4 Ω
b. 2.0 Ω
c. 4.0 Ω
d. 8.0 Ω
e. 16 Ω ____ 8. A deuteron is accelerated from rest through a 10kV potential difference and then moves perpendicularly
a. 20 W
to a uniform magnetic field with B = 1.6 T. What is the radius of the resulting circular path? (deuteron:
b. 17 W
m = 3.3 × 10−2 7 kg, q = 1.6 × 10−1 9 C)
c. 12 W
a. 19 mm
d. 31 W
b. 13 mm
e. 6.0 W
c. 20 mm ____ 17. ____ 15. ____ 18. ____ 16. a. 200 µT
b. 600 µT
c. 450 µT
d. 300 µT
e. 400 µT
On the average, in a ferromagnetic domain permanent atomic magnetic moments are aligned ____ to
one another.
Two long parallel wires are separated by 6.0 mm. The current in one of the wires is twice the other
a. antiparallel
c parallel
b. urrent. If the magnitude of the force on a 3.0m length of one of the wires is equal to 8.0 µN, what is
t greater of the
c.he perpendicular two currents?
a. 0.20 A
d. alternately parallel and antiparallel
b. 0.40 A
e. randomly relative
c. 40 mA
Td. c20 mAloops are coaxial and coplanar. One has radius a and the other has radius 2 a. Current 2 I in
wo urrent
the outer loop is parallel to current I in the inner loop. The magnitude of the magnetic field at the center
e. 0.63 A
of the two loops is
a. wo solenoids are each made of 2 000 turns of copper wire per meter. Solenoid I is 2 m long, while
T 0.
µ0 I
solenoid II is 1 m long. When eq...
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This note was uploaded on 02/25/2014 for the course PHYSICS 202 taught by Professor Pan during the Fall '11 term at University of Wisconsin.
 Fall '11
 PAN
 Magnetism

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