A coil of wire rotates in the space between the poles of an electromagnet that produces a uniform magnetic field. If the rotation rate is increased, the maximum output voltage
A. increases.
B. stays the same.
C. decreases.
A. increases.
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A flat conductor of thickness 0.500 mm is placed in a magnetic field of 0.200 T perpendicular to the flat surface. If there are 
charge carriers (i.e., electrons) per m3, what is the Hall voltage generated when 3.40 A flows along the conductor?
A. 0.266 mV B. 0.531 mV C. 0.797 mV D. 1.06 mV E. 2.12 mV
A 4.00-kg block rests on a 30.0° incline as shown in the figure. If the coefficient of static friction between the block and the incline is 0.700, what magnitude horizontal force F must act on the block to start it moving up the incline?
A) 34.0 N B) 51.1 N C) 54.7 N D) 84.0 N E) 76.4 N
A wooden block slides directly down an inclined plane, at a constant velocity of 6.0 m/s. How large is the coefficient of kinetic friction, ?k, if the plane makes an angle of 25.° with the horizontal?
A) 0.47 B) 0.91 C) 1.2 D) 0.42 E) 0.37
A series of 3 uncharged concentric shells surround a small central charge q. The charge distributed on the outside of the third shell is
a. ?3q. b. ?(ln 3)q. c. +q. d. +(ln 3)q. e. +3q.