An emf of 0.52 V is induced in a 0.71-H inductor. What is the rate of change of current through the inductor?
a. 0.73 A/s
b. 1.4 A/s
c. 0.37 A/s
d. 1.23 A/s
e. 0.71 A/s
a
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If M = 6.0 kg, what is the tension in string 1?
A. 39 N B. 34 N C. 29 N D. 44 N E. 51 N
Enrico says that positive charge is created when you rub a glass rod with silk, and that negative charge is simply the absence of positive charge. Rosetta says that negative charge is created and that positive charge is the absence of positive charge. (She has heard that Ben Franklin should have reversed the signs he associated with the charges.) Which one, if either, is correct?
a. Enrico, because there really is only one kind of charge. b. Rosetta, because there really is only one kind of charge. c. Neither: although no charge is present originally, both types of charge are created through friction. d. Both: only one type of charge is created by friction at any one time. e. Neither: both negative and positive charge are present simultaneously in all solid materials on Earth and the process described involves a transfer of charge, not the creation of charge.
A long straight wire is carrying a current of 2.4 A in a region where the magnetic field is perpendicular to the wire. If the magnetic field is 0.52 mT and makes a 60 
angle with the wire, what is the magnitude of the force on 3.0 m of the wire?
A. 3.2 N
B. 6.5 N
C. 
D. 
E. 
In a neutron star, the core is:
A) made of compressed neutrons in contact with each other. B) electrons and protons packed so tightly they are in contact. C) constantly expanding and contracting. D) primarily iron and silicon. E) no longer rotating.