When a switch is closed, completing an LR series circuit, the time needed for the current to reach three-quarters its maximum value is ____ time constants
a. 0.500
b. 0.693
c. 0.725
d. 1.33
e. 1.39
e
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A loop of wire is moved through a region of uniform magnetic field. As it is moved, its orientation with respect to the magnetic field direction does not change. The induced current at this time in the loop:
A. depends on the shape of the loop B. depends on the magnitude of the field C. depends on the speed with which it is moved D. is zero E. depends on the acceleration of the loop
A package of supplies is dropped from a plane, and one second later a second package is dropped. Neglecting air resistance, the relative velocity of the 1st package viewed from the second will
A) depend upon their weight. B) be constant. C) increase. D) decrease. E) be zero.
Using the Equivalence Principle as a guide, explain how one might cancel out (or make disappear) a gravitational field
What will be an ideal response?
In what way is electric charge related to photons?
A) Photons are electrically-charged particles. B) They are not related at all. C) Electrically-charged particles interact by exchanging photons. D) Photons interact by exchanging electrically-charged particles. E) Electrically-charged particles are made of photons.