Which statement about energy generated from wind is true? a. wind is free "fuel," and government taxes on its use are lower than those on fossil fuel are b. wind power is abundant everywhere, and battery storage of excess power is inexpensive. c. wind power uses more water than coal power plants, but it is a far safer power source for wildlife. d. wind power gives off no greenhouse gases, but some people feel it spoils the view of the landscape.

Irrigation channels that require regular flow monitoring are often equipped with electromagnetic flowmeters in which the magnetic field is produced by horizontal coils embedded in the bottom of the channel. a particular coil has 100 turns and a diameter of 6.0 m. when it's time for a measurement, a 4.5 a current is turned on. the large diameter of the coil means that the field in the water flowing directly above the center of the coil is approximately equal to the field in the center of the coil. the field is directed downward and the water is flowing east. the water is flowing above the center of the coil at 1.5 m/s . what is the magnitude of the field at the center of the coil? what is the direction of the force on a positive ion in the water above the center of the coil? what is the magnitude of the force on an ion with a charge +e?