Induction: Electrically neutral objects cannot exert an electrical force on each other, but they can exert a gravitational force on each other.
A. True
B. False
Answer: B
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Winds are generated on Earth primarily because of
a. strong updrafts from the equator and air sinking near the poles. b. uneven heating of the surface and rotation of the planet. c. water condensation onto mountains. d. hot air rising and cool air sinking.
Each of two parallel wires separated by 8.0 mm carries a 20-A current. These two currents are oppositely directed. Determine the magnitude of the magnetic field at a point that is 5.0 mm from each of the wires
a. 2.0 mT b. 1.6 mT c. 1.3 mT d. 1.8 mT e. 1.0 mT
Fill in the blank in the following chemical reaction that occurs in theSun: Deuterium+proton = ?? + energy:
a) hydrogen-1 b) helium-3 c) deuterium-2 d) carbon-12 e) helium-4
One difference between moving charges and stationary charges is that
A) moving charges exert both electric and magnetic forces, while stationary charges exert neither electric nor magnetic forces. B) moving charges exert only magnetic forces, while stationary charges exert both electric and magnetic forces. C) moving charges exert both electric and magnetic forces, while stationary charges exert only electric forces. D) moving charges exert only magnetic forces, while stationary charges exert only electric forces. E) moving charges stay slender, while stationary charges are couch potatoes.