The focal lengths of the objective and the eyepiece in a microscope are 0.290 cm and 2.50 cm, respectively. An object is placed 0.300 cm from the objective
The image of this object is viewed with the eyepiece adjusted for minimum eyestrain (image at the far point of the eye) for a person with normal vision. What is the distance between the objective and the eyepiece?
A) 9.85 cm
B) 10.1 cm
C) 10.4 cm
D) 11.2 cm
E) 11.5 cm
Answer: D
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Suppose that you hold a short segment of wire vertically in a magnetic field that is directed horizontally toward you. If the wire segment carries conventional current in an upward direction, the direction of the magnetic force exerted on the wire is
A. Rightward B. Leftward C. Upward D. Downward E. Toward you F. Away from you
Imagine that we constrain a rectangular loop to move through a square region where the magnetic field 
is uniform and downward (in the -z direction), as shown below. Assume that 
outside that region. We can divide the loop’s motion up into five phases: For each of the five phases, which of the following is true? The loop has not yet entered the magnetic field.
A. Current flows clockwise in the loop.
B. Current flows counterclockwise in the loop.
C. Current does not flow in the loop.
The mass of 1H is 1.007825 u and the mass of 1n is 1.008665 u. The mass of 12C is 12.000000 u, of 13N is 13.005739 u, and of 14N is 14.003074 u. What is the binding energy of the last proton in 13N?
A) 2.5 MeV B) 1.9 MeV C) 9.8 MeV D) 10.6 MeV E) 3.8 MeV
An electric current can consist of
a. positive ions flowing in a liquid. b. negative ions flowing in a liquid. c. electrons flowing in a wire. d. all of the above.