A 2.0-C charge moves with a velocity of (
) m/s and experiences a magnetic force of (
) N. The x component of the magnetic field is equal to zero. Determine the z component of the magnetic field.
A. ?3.0 T
B. +3.0 T
C. +5.0 T
D. ?5.0 T
E. +6.0 T
Answer: C
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Velocity: A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, and then 1.0 km north to return to its starting point. This trip takes 45 min. What was the bear's average velocity?
A. 0.00 km/h B. 0.067 km/h C. 4.0 km/h D. 5.3 km/h
A power line with a resistance of 2 ohms carries a current of 80 A. The power dissipated in the line is
A) 40 W. B) 160 W. C) 320 W. D) 12,800 W. E) none of the above
A superconductor expels any magnetic field from its interior. This is called
a. electromagnetic induction. b. Maxwell's effect. c. magnetic declination. d. the Meissner effect. e. none of the above.
Consider a situation where you carry a 20 N box up a flight of stairs, raising its elevation by 5 m. The increase of potential energy of the box is
a. 0 c. 100 J b. 4 J d. none of the above