A conducting rod is sliding on metal rails with velocity v. A magnetic field B is into the paper, the separation of the rails is L, and the resistance of the circuit is R. In what direction in the diagram is the current flowing in the resistor?
A. up
B. down
C. up then down
D. down then up
E. Insufficient information given,
B. down
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A. The component of the curl in this direction is positive. B. The component of the curl in this direction is negative. C. The component of the curl in this direction is zero.
A metal sphere of radius 10 cm carries a charge of +2.0 ?C. What is the magnitude of the electric field 5.0 cm from the sphere's surface?
A) 4.0 × 105 N/C B) 8.0 × 105 N/C C) 4.0 × 107 N/C D) 8.0 × 107 N/C E) 4.0 × 109 N/C
In the first law of thermodynamics, the work can be
a. only positive. b. only negative. c. neither. d. either positive or negative.
Two masses m1 and m2, having m1 > m2, are launched with the same speed in the direction b. Which mass reaches the greatest height?