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Unformatted text preview: . An AC generator operating at a frequency of f = 60 cycles/second has an RMS emf of 80
V. It is connected to the leads of a 2.0 x 104 F capacitor with negligible resistance.
What is the RMS current supplied by the generator (in A)?
A) 27
B) 13
C) 19
D) 6.0
E) 42 3. The inductor is a solenoid with an internal resistance of R = 0.15 What is the current
flowing through the battery 8 seconds after closing the switch? 6V A)
B)
C)
D)
E) L 30 A
3A
40 A
18 A
12 A Version 1 Page 2 2H 4. A circular coil of wire has 25 turns and has a radius of 0.075 m. The coil is located in a
variable magnetic field whose behavior is shown on the graph. At all times, the
magnetic field is directed at an angle of 75° relative to the normal to the plane of a loop.
What is the average emf induced in the coil in the time interval from t = 5.00 s to 7.50 s? A)
B)
C)
D)
E) 180 mV
140 mV
18 mV
92 mV
49 mV 5. A cylindrical region of radius R contains a uniform conduction current density, parallel to
t The time
dependence of
J is irrelevant
because no
time derivatives
appear in the
conduction
current part of
amperes law. its axis, with magnitude that is exponentially decaying with time, J (t ) J 0e . The
magnitude of the magnetic field at radius r at a particular moment in time inside the
cylindrical region (r<R) is proportional to:
A) r0 (constant)
B) r
C ) r2
D) 1/r
E) 1/r2 6. A toroidal solenoid with 400 turns of wire and a mean radius of 6.0 cm carrie...
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This document was uploaded on 03/11/2014 for the course PHYSICS 240 at University of Michigan.
 Fall '08
 DaveWinn
 Physics

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