A magnetic force acts most strongly on a current carrying wire when it
A) carries a very large current.
B) is perpendicular to the magnetic field.
C) either or both of these
D) none of the above
Answer: C
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Acceleration: A racing car accelerates uniformly from rest along a straight track. This track has markers spaced at equal distances along it from the start, as shown in the figure. The car reaches a speed of 140 km/h as it passes marker 2. 
Where on the track was the car when it was traveling at half this speed, that is at 70 km/h?
A. Before marker 1 B. At marker 1 C. Between marker 1 and marker 2
The Moon moves ________ relative to the background stars over the course of an evening.
A. northward B. eastward C. westward D. southward E. The Moon does not move relative to the background stars.
A single-turn loop of wire, having a resistance of 8.00 ? and a cross-sectional area 200 cm2, is perpendicular to a uniform magnetic field that increases steadily from 0.200 T to 2.800 T in 2.20 seconds
What is the magnitude of the induced current in the loop? A) 2.95 A B) 3.18 A C) 0 A D) 3.18 mA E) 2.95 mA
You live at a latitude of 73° N. What is the angle between the northern horizon and the north celestial pole?
a. 73° b. 27° c. 17° d. 23.4° e. 5°