Each of the four diagrams below shows a hypothetical electric field in a certain region of empty space where the magnetic field is constant in time. 
Which of the fields are physically impossible and why?
A. This field violates Faraday’s law.
B. This field violates Gauss’s law.
C. This field violates both of the above laws.
D. This field is physically possible.
B. This field violates Gauss’s law.
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A certain photon after being scattered from a free electron at rest moves at an angle of 120° with respect to the incident direction. If the wavelength of the incident photon is 0.591 nm, what is the wavelength of the scattered photon?
A) 0.380 nm B) 0 nm C) 0.550 nm D) 0.591 nm E) 0.595 nm
Unlike electric potential, the electric potential energy is a vector quantity
Indicate whether the statement is true or false
Find the change in entropy (in J/K) when 5.00 moles of an ideal gas undergo a free expansion from an initial volume of 20 cm3 to a final volume of 100 cm3
a. 71 b. 52 c. 67 d. 191 e. 208
A policeman walks on his beat back and forth. His average speed is determined from
A. time divided by how far he ends up from the starting point. B. his velocity divided by the time. C. time divided by his total distance covered. D. his total distance covered divided by the time.