Consider a wire bent in the hairpin shape shown below. The wire carries a conventional current I as shown. What is the magnitude 
of the magnetic field
at point a?
A. ?0 I/4?R
B. ?0 I/2?R
C. ?0 I/?R
D. ?0 I/R
E. (2 + ?)?0 I/4?R
F. Zero
E. (2 + ?)?0 I/4?R
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A ray of light traveling in air strikes the surface of a certain plastic slab at 63.0° with respect to the normal in air. It travels in the plastic slab at a 30.6° angle with respect to the normal. Find the critical angle for the plastic in air
What will be an ideal response?
Mary builds a simple magnifying telescope using two lenses of focal length 80. cm and 5.0 cm. The respective diameters are 60. mm and 10. mm
How many degrees wide does the moon appear through the telescope if it appears only 1/2 degree wide with the "naked eye"?
X-rays of wavelength 0.080 nm are used in a Bragg scattering experiment with a crystal. If the first order maximum is found at a grazing angle of 
what is the plane spacing in the crystal?
A. 0.31 nm B. 0.71 nm C. 1.4 nm D. 0.38 nm E. 0.77 nm
The rings of Uranus and Neptune are found:
A) by the Hubble Space Telescope. B) above their equators. C) in the ecliptic plane. D) outside the Roche limit. E) All of the above.