If Q = 80 nC, a = 3.0 m, and b = 4.0 m in the figure, what is the magnitude of the electric field at point P?
A. 45 N/C
B. 70 N/C
C. 29 N/C
D. 47 N/C
E. 92 N/C
Answer: D
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True or false: it is possible to have the electric field be 0 at some point is space and the electric potential be non-zero at that same point
1.True 2.False
How strongly, and in what direction, does a 1-newton apple pull on Earth?
A) It pulls downward, with a force of 1 newton. B) It pulls upward, with a force of 1 newton. C) It pulls upward, with a force that is much smaller than 1 newton. D) The apple does not pull on Earth at all; it is Earth that pulls downward on the apple. E) It pulls upward, with a force that is much larger than 1 newton.
When astronomers look at distant galaxies, what sort of motion do they see?
A. Galaxies are orbiting a single point in the Universe. B. The galaxies are all moving rapidly toward us. C. Galaxies in half of the sky are moving away from us. Those in the other half are approaching. D. The galaxies are all moving rapidly away from us. E. The galaxies are all spinning rapidly.
Suppose that, through the malicious act of an eight-dimensional alien being, the strong force was suddenly turned off throughout the universe. What would happen almost immediately to atoms?
A) Electrons would fall into the nuclei of atoms. B) Atoms would be immediately ionized. C) The nuclei of atoms would fall apart. D) Gravity would become the strongest force in nature. E) nothing