Induction: 
X and Y are two initially uncharged metal spheres on insulating stands, and they are in contact with each other. A positively charged rod R is brought close to X as shown in part (a) of the figure. Sphere Y is now moved away from X, as shown in part (b). What are the final charge states of X and Y?
A. Both X and Y are neutral.
B. X is positive and Y is neutral.
C. X is neutral and Y is positive.
D. X is negative and Y is positive.
E. Both X and Y are negative.
Answer: D
You might also like to view...
Matter can be defined as anything that ______________ ______________ and ______________ ______________
Fill in the blank(s) with correct word
The postulate(s) of special are (is)
A. the speed of light is the same in all inertial reference frames. B. E0= mc2. C. the principle of conservation of momentum is true. D. the laws of physics are the same in all inertial reference frames. E. the principle of conservation of energy is true.
Why do nuclear fusion reactions only take place in the interior of a star?
a. The magnetic fields are strongest there. b. The temperature is the hottest in the center. c. The density of material is very high in the center. d. Both (b) and (c) e. FALSE; Nuclear fusion reactions can take place in the core and corona where temperatures are high enough.
Compared to Ida, Eros, and Gaspra, what was odd about Mathilde?
A) It had a small moon, so we could more accurately find its mass. B) It was much denser, probably made of iron and nickel, a class M asteroid. C) It was less dense than water, indicating it was a comet nucleus, rather than an asteroid. D) It was less dense than rock, but more than ice, suggesting a porous structure. E) It was the same density as the Earth's Moon, indicating it had been knocked off our Moon.