Two long parallel wires separated by 4.0 mm each carry a current of 24 A. These two currents are in the same direction. What is the magnitude of the magnetic field at a point that is between the two wires and 1.0 mm from one of the two wires?
a. 4.8 mT
b. 6.4 mT
c. 3.2 mT
d. 9.6 mT
e. 5.3 mT
C
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Frictional forces between a probe and a sample are measured with a variant of which microscope?
(a) An optical microscope (b) A SEM (c) A STM (d) An AFM
The force due to gravity has the mathematical form 
.
a. True
b. False
Indicate whether the statement is true or false
From stage 4 to stage 7 of star formation, the object plotted on the H-R diagram moves so that:
A) its luminosity decreases, while its temperature increases. B) its luminosity decreases, while its temperature stays the same. C) its luminosity increases, while its temperature increases. D) its luminosity increases, while its temperature stays the same. E) its luminosity stays the same, and its temperature stays the same.
Five objects of mass m move at velocity 
at a distance r from an axis of rotation perpendicular to the page through point A, as shown below. The one that has zero angular momentum about that axis is
A.
B.
C.
D.
E.
