A segment of wire of total length 3.0 m carries a 15-A current and is formed into a semicircle. Determine the magnitude of the magnetic field at the center of the circle along which the wire is placed
a. 1.6 ?T
b. 4.9 ?T
c. 1.0 ?T
d. 9.8 ?T
e. 15 ?T
b
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A farsighted boy has a near point at 2.3 m and requires contact lenses to correct his vision to the normal near point. What is the correct choice of lens power for the contact lenses?
A) -0.28 diopters B) +0.28 diopters C) -3.6 diopters D) +3.6 diopters E) +1.8 diopters
Thin Films: When a light wave enters into a medium of different refractive index,
A. only its speed and frequency change. B. only its speed and wavelength change. C. only its frequency and wavelength change. D. its speed, frequency, and wavelength change.
Imagine you throw a tennis ball vertically into the air. At the exact top of its trajectory it is at rest. What is the magnitude of its acceleration at this point?
A. 9.8 m/s2
B. –9.8 m/s2
C. 0 < 
< 9.8 m/s2
D. 0
E. Other (specify)
Unlike other particles, photons have a finite momentum even though they have no mass
Indicate whether the statement is true or false