- #1
aMajor
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Hi guys,
I was answering some questions on my physics homework and I didn't understand why the answer was what it was...
the first question was this:
1.) A hollow uncharged metal ball hangs from a silk thread. A glass rod has been charged by rubbing with rayon. When it is brought close to the ball without touching, the ball
-doesn’t change its position butbegins to revolve.
-remains in its originalposition.
-is attracted.
-is repelled.
I said it was attracted because the glass rod is negatively charged and the positive nucleus of the metal ball is attracted to it through induction.
The follow up question to the first question was:
2.) You now touch the ball from Question 2 with the end ofthe charged rod. Which answer best describes what happens next?
-The ball remains in contact with the rod for a long time.
-The ball remains in contact momentarily,then is repelled.
-The ball bounces off and onto the charged end of the rod, as it picks up and loses charge.
-The ball bounces and revolves.
The right answer is option number 2...but I don't understand why. I thought the ball would pick up the charge from the charged rod, but I guess it wouldn't lose charge...
I'm not sure why the ball is repelled from the rod. Can anyone explain?
Thank you very much!
-Duylam
I was answering some questions on my physics homework and I didn't understand why the answer was what it was...
the first question was this:
1.) A hollow uncharged metal ball hangs from a silk thread. A glass rod has been charged by rubbing with rayon. When it is brought close to the ball without touching, the ball
-doesn’t change its position butbegins to revolve.
-remains in its originalposition.
-is attracted.
-is repelled.
I said it was attracted because the glass rod is negatively charged and the positive nucleus of the metal ball is attracted to it through induction.
The follow up question to the first question was:
2.) You now touch the ball from Question 2 with the end ofthe charged rod. Which answer best describes what happens next?
-The ball remains in contact with the rod for a long time.
-The ball remains in contact momentarily,then is repelled.
-The ball bounces off and onto the charged end of the rod, as it picks up and loses charge.
-The ball bounces and revolves.
The right answer is option number 2...but I don't understand why. I thought the ball would pick up the charge from the charged rod, but I guess it wouldn't lose charge...
I'm not sure why the ball is repelled from the rod. Can anyone explain?
Thank you very much!
-Duylam