Consider a current moving from left to right through a resistor. Which end of the resistor is at higher potential?
A) left
B) right
C) indeterminate, depends if current is charging a battery or discharging a battery
A
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If a copper alloy is in the (O) condition, it is _________.
Fill in the blank(s) with the appropriate word(s).
The cause of the pulsations we see in the light from neutron stars is
A) the in and out pulsations of star's radius, as the star gets rapidly larger and then smaller. B) pulsations of its neutrons. C) the spinning motion of the star. D) motions of electrons within the star. E) Nonsense--neutron stars do not pulsate.
A bar magnet is attached solidly to a frictionless surface and its length is aligned with the x axis. To the right of the first magnet a short distance away is a second bar magnet with its center placed on the x axis and its length perpendicular to the x axis. The second magnet is free to move. Once placed in position at rest, which best describes the initial motion of the second magnet?
a. The magnet will move away from the fixed magnet. b. The magnet will not move. c. The magnet will move toward the fixed magnet. d. The magnet will start to rotate.
When the voltage across a steady resistance is doubled, the current
A) is half. B) remains the same. C) is doubled. D) is quadrupled.