How is the energy stored in a current-carrying inductor related to the current value, I?
a. directly proportional to I 2
b. directly proportional to I 1/2
c. directly proportional to I
d. inversely proportional to I
a
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The dark area stretching from the center of this picture to the upper right is about 50 light-years long and lies in the plane of the Milky Way Galaxy. What is it?
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Two coils are placed near each other as shown in Figure OQ31.9. The coil on the left is connected to a battery and a switch, and the coil on the right is connected to a resistor. What is the direction of the current in the resistor after the switch has been closed for several seconds?
Mars has two moons, Phobos and Deimos
a. True b. False Indicate whether the statement is true or false
Which of the following describes the most convincing evidence in support of the idea that human activity is causing climate change on Earth?
A) Polls show that a majority of Americans agree that this is the case. B) The vast majority of scientists say so. C) The known science behind the greenhouse effect predicts that warming should be occurring as the carbon dioxide concentration rises, and the average temperature is rising as expected. D) There is no other known process besides the burning of fossil fuels that can lead to any change in Earth's average temperature.