If the magnetic field from a current-carrying long straight wire has a magnitude 
at a distance d, what is the magnitude of the field at a distance 2d?
A. also 
B. 0.707
C. 0.693
D.
/2
E. 
/4
D./2
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The average speed of light is greatest in
A) red glass. B) orange glass. C) green glass. D) blue glass. E) same in all of these
The exchange of mediating photons can produce
a. neither a repulsive nor an attractive force. b. either a repulsive or an attractive force. c. a repulsive force. d. an attractive force.
A 7.00-kg mass is placed on a 28.0° incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.574, and the coefficient of sliding friction is 0.528 . What is the frictional force in this situation?
a. 32.2 N b. 60.6 N c. 32.0 N d. 34.8 N e. 3.29 N
Two important properties of young neutron stars are:
A) extremely slow rotation and a strong magnetic field. B) extremely rapid rotation and a weak magnetic field. C) extremely rapid rotation and a strong magnetic field. D) no rotation and a weak magnetic field. E) no rotation and no magnetic field.