Two conducting spheres X and Y mounted on insulating stands respectively. X carries positive charges and Y carries negative charges. As Y is moved slowly towards X (but without touching X), the total charges on X ......
A. increases and are positive
B. increases and are negative
C. become negative
D. disappear
E. remain unchanged
plx explain~~~
phy- induction
2009-01-10 6:24 am
回答 (2)
2009-01-10 8:35 pm
✔ 最佳答案
The answer is option E. The physics principle invloved is the Conservation of Charge.Be aware that although the total charge on sphere X remains the same, there is a re-distribution of charge on the sphere surface. Charges moves, from the previous even distribution on sphere surface, to the side facing the other sphere (sphere Y).
2009-01-10 7:41 pm
I think it should be E. Since the 2 charged spheres do not touch eachother, no flow of charges occur. Therefore the charges stay where they are. The charge on the spheres remain unchanged.
參考: I hope I am right
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