A current in a long, straight wire produces a magnetic field. The magnetic field lines:
a. go out from the wire to infinity.
b. come in from infinity to the wire.
c. form circles that pass through the wire.
d. form circles that go around the wire.
d
You might also like to view...
When a charged particle is moving in a static uniform magnetic field
A) there will always be a magnetic force exerted on it, regardless of its direction of motion. B) there may be a magnetic force exerted on it which will cause its speed to change. C) there may be a magnetic force exerted on it, but its speed will not change. D) there may be a magnetic force exerted on it, but its direction of motion will not change. E) None of the above statements are true.
A heat engine has an efficiency of 35.0% and receives 150 J of heat per cycle
(a) How much work does it do in each cycle? (b) How much heat does it "waste" in each cycle?
A Carnot engine operating between reservoirs at 500°C and 300°C would have an efficiency of approximately
A. 0.30. B. 0.50. C. 0.67. D. 0.74. E. 0.11.
Captain Ray, on the Galactic Explorer, sets off bright signal lights at the two ends of his spaceship so that they are seen as flashing simultaneously by General Kay, who is watch the ship go by. General Kay concludes that she was next to the midpoint of the ship at the instant when the lights flashed in her reference frame. This can only happen if Captain Ray, at the center of the Galactic
Explorer, a. sees the lights flash simultaneously in his coordinate system. b. sees the bow (front) light flash before the aft (rear) light. c. sees the aft (rear) light flash before the bow(front light. d. can calculate that the light flashes reach General Kay so that the flash from the bow light reaches her before the flash from the aft light. e. can calculate that the light flashes reach General Kay so that the flash from the aft light reaches her before the flash from the bow light.