A rectangular loop (area = 0.15 m2) turns in a uniform magnetic field with B = 0.20 T. At an instant when the angle between the magnetic field and the normal to the plane of the loop is (?/2) rad and increasing at the rate of 0.60 rad/s, what is the magnitude of the emf induced in the loop?
a. 24 mV
b. zero
c. 18 mV
d. 20 mV
e. 6.0 mV
c
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Two charges are located on the x-axis. A 22 ?C charge is located at the origin and a 47 ?C charge is located at x = 4.0 m. What is the magnitude of the electric field at x = 7.5 m?
a. 
b. 
c. 
d. 
e. 
The vector sum of three co-planar forces
A. must be zero. B. must be perpendicular to one of the three. C. must be parallel to one of the three. D. must be perpendicular to the plane. E. may have any direction in the plane.
The highest energy level in an atom is its
a. ionization level. b. emission level. c. absorption level. d. photon level. e. ground state.
A fountain sends water to a height of 113 m. What must be the pressurization (above atmospheric) of the underground water system? (1 atm = 105 N/m2)
a. 1.0 atm b. 47.1 atm c. 12.1 atm d. 11.1 atm e. 0.115 atm