At a particular instant, a proton moves Eastward in a uniform magnetic field that is directed straight downward. The magnetic force that acts on it is
A) to the South.
B) zero.
C) directed upward.
D) Northward.
E) Westward.
D
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Indicate whether the statement is true or false
Why are transformer cores made of laminated, rather than solid, magnetic material?
What will be an ideal response?
Velma passes Mort at a high speed. Velma and Mort each have identical light-clocks. Mort and Velma both observe both clocks to "tick" simultaneously at 12 noon on both clocks. Mort observes that Velma's next tick occurs
A) only after the second drink. B) after his own clock ticks. C) before his own clock ticks. D) before or after or at the same time as his own tick, depending on Velma's precise speed. E) at the same time as the tick on his clock.
When the frequency of the source of a water wave increases, the distance between successive peaks in the wave
a. remains unchanged b. increases c. decreases d. cannot be determined