A changing current in one loop of wire can induce a current in another loop of wire even though the wires do not touch. The induced current appears almost instantaneously for loops close together. How can this energy exchange happen?
a. This is one of those things for which science has no adequate explanation yet.
b. The second loop is affected by the thermal exchange from the heating of the first loop.
c. It is a gravitational effect on the electrons.
d. It is done via an electromagnetic wave.
D
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The age of the Milky Way galaxy has been estimated to be at least 13 billion years based on
a. observations of globular clusters. b. observations of open clusters. c. 21-cm radiation from H I regions. d. the rotation curve of the galaxy. e. the energy produced by Sagittarius A.
The ____________________ planets have larger radii than the ____________________ planets
Fill in the blank(s) with correct word
Describe two ways of detecting extrasolar planets
What will be an ideal response?
Fuses and circuit breakers are used to prevent
a. electrical shocks. b. wires overheating and causing fires. c. save on the cost of electricity. d. to store energy.