Two charged particles attract each other with a force F. If the charges of both particles are doubled, and the distance between them also doubled, then the force of attraction will be
A) F.
B) 2 F.
C) F/2.
D) F/4.
E) none of the above
Answer: A
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Fill in the blank(s) with the appropriate word(s).
What is the direction of 
in the wave as it passes S?
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