The commutator in a direct-current motor:
a. starts the loop rotating.
b. holds the loop steady.
c. allows the motor to run on alternating current from a standard wall socket.
d. keeps the current flowing in the same direction through the coil.
e. reverses the direction of electric current through the coil.
e
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Polarization: Unpolarized light passes through three ideal polarizing filters. The first filter is oriented with a horizontal transmission axis, the second one has its transmission axis at 30° from the horizontal, and the third filter has a vertical transmission axis. What percent of the light gets through this combination?
A. 9.4% B. 91% C. 50% D. 0% E. 33%
Lower compression values lead to a greater loss of image data.
Answer the following statement true (T) or false (F)
What is the importance of the carbon dioxide (CO2 ) cycle?
A) It makes the growth of continents possible. B) It allows for an ultraviolet-absorbing stratosphere. C) It regulates the carbon dioxide concentration of our atmosphere, keeping temperatures moderate. D) It will prevent us from suffering any consequences from global warming.
An electric current produces
A) a gravitational field. B) an electric field. C) a magnetic field. D) an electromagnetic field. E) a universal field.