After a switch is thrown to remove the battery from a DC LR circuit, but the circuit is still left complete, the time constant represents
a. the time rate of change of the current in the circuit.
b. the time rate of change of the induced emf in the circuit.
c. the magnitude of the ratio of the current to the time rate of change of the current.
d. all of the above. e. only (a) and (b) above.
C
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The elastic modulus in most materials _________as the temperature increases.
Fill in the blank(s) with the appropriate word(s).
A planet is located orbiting another star and its radius is about 3 times that of the Earth. It is:
A) a brown dwarf. B) a Jupiter. C) a Neptune. D) a super-Earth. E) an Earth.
What happens to the resistivity of a typical semiconductor as its temperature increases?
A) The resistivity increases for a while and then decreases. B) The answer depends on the semiconductor. C) The resistivity decreases. D) The resistivity increases. E) The resistivity remains the same.
Which of the following is calculated by dividing the ratio of exposed subjects to nonexposed subjects in the case group by the ratio of exposed subjects to nonexposed subjects in the control group?
What will be an ideal response?