A non-conducting sphere of radius R = 7.0 cm carries a charge Q = 4.0 mC distributed uniformly throughout its volume
At what distance, measured from the center of the sphere, does the electric field reach a value equal to half its maximum value?
A) 3.5 cm only
B) 4.9 cm only
C) 3.5 cm and 9.9 cm
D) 3.5 cm and 4.9 cm
E) 9.9 cm only
Answer: C
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An electrically neutral metal sphere hangs from an insulating thread. A charged glass wand is brought near to the sphere. Describe what occurs next:
A. The sphere is attracted to the wand B. The sphere is neither attracted nor repelled, since it is electrically neutral C. The sphere is repelled by the wand D. The sphere will become charged
Current estimates place the age of the universe at about
A) 10 billion years. B) 10 million years. C) 14 billion years. D) 4 billion years.
Bohr's revolutionary step in his theory was to ______________ the angular momentum of the electron
Fill in the blank(s) with correct word
Since the planet receives a net of about 100 W/m2, would a change of 4 W/m2 be considered substantial? Explain. (Chapter 17 shows that this is the size of the greenhouse effect.)
What will be an ideal response?