Two solenoids are each made of 2 000 turns of copper wire per meter. Solenoid I is 2 m long, while solenoid II is 1 m long. When equal currents are present in the two solenoids, the ratio of the magnetic field BI along the axis of solenoid I to the magnetic field BII along the axis of solenoid II, BI/BII, is
a. 1/4.
b. 1/2.
c. 1.
d. 2
e. 4.
c
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Consider a two-component complex vector 
where a and b are real numbers. Which of the following vectors are orthogonal to this vector?
A. 
B. 
C. 
D. 
E. 
F.C and D
T. None of the above.
Since we know that the 55 mile per hour speed limit saves lives and gasoline, try to find reasons the speed limit on interstate highways has been set to 65 miles per hour and above in most states
What will be an ideal response?
Which is NOT true about neutron stars?
A. They have radii much larger than the Sun. B. They sometimes are observed as pulsars. C. They sometimes remain after a supernova. D. They are rapidly rotating. E. They have strong magnetic fields.
An object 20-cm high is placed 50.0 cm in front of a lens whose focal length is 5.00 cm. Where will the image be located (in cm)?
A. 5.13 B. 5.56 C. 5.72 D. 5.93 E. 4.55