Two long, parallel wires carry currents of different magnitudes. If the current in one of the wires is doubled and the current in the other wire is halved, what happens to the magnitude of the force between these two wires?
A) It is doubled.
B) It stays the same.
C) It is tripled.
D) It is quadrupled.
E) It is reduced by a factor of 2.
B
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An electron is briefly accelerated in the direction shown in the figure below and to the left. It creates an EM wave pulse that eventually reaches points P and S 
What is the direction of the wave’s motion at point P?
A. A B. B C. C D. D E. Toward the viewer. F. Away from the viewer. T. The vector is zero. G. AA
Determine the rate of heat transfer per unit length from a 5-cm-OD pipe at 150°C placed eccentrically within a larger cylinder of 85% Magnesia wool as shown in the sketch. The outside diameter of the larger cylinder is 15 cm and the surface temperature is 50°C.
GIVEN
A pipe placed eccentrically within a larger cylinder of 85% Magnesia wool as shown in the sketch
Outside diameter of the pipe (Dp) = 5 cm = 0.05 m
Temperature of the pipe (Ts) = 150°C
Outside diameter of the larger cylinder (Do) = 15 cm = 0.15 m
Temperature of outer pipe (To) = 50°C
FIND
The rate of heat transfer per meter length (q)
ASSUMPTIONS
Two dimensional heat flow (no end effects)
The system is in steady state
Uniform thermal conductivity
SKETCH
A circular loop of wire of area 25 cm2 lies in the plane of the paper. An increasing magnetic field B is coming out of the paper. What is the direction of the induced current in the loop?
A) There is no current. B) counterclockwise then clockwise C) clockwise then counterclockwise D) clockwise E) counterclockwise
Latent Heats: If you add 1.33 MJ of heat to 500 g of water at 50°C in a sealed container, what is the final temperature of the steam? The latent heat of vaporization of water is 22.6 × 105 J/kg, the specific heat of steam is 2010 J/kg ? K, and the specific heat of water is 4186 J/kg ? K.
A. 100°C B. 112°C C. 123°C D. 147°C E. 195°C