1. A positively charged strip is brought near a strip placed in a stirrup which is free to turn. There is a force of attraction. Which of the following could be true about the strip in the stirrup?

i. it is uncharged
ii. it has a negative charge
iii. it has a positive charge

2.

3. Originally Posted by european SENS
A positively charged strip is brought near a strip placed in a stirrup which is free to turn. There is a force of attraction. Which of the following could be true about the strip in the stirrup?

i. it is uncharged
ii. it has a negative charge
iii. it has a positive charge

I'd say i. and ii.

Where did this question come from?

4. A test I got back. Me and a teacher had a disagreement about the answer. I said it could be multiple and she informed me that there is only one correct answer. I wanted to get an oppinion before I went and argued with her though.

5. ii.

6. Oh.

Well, maybe I'm not imagining the setup correctly, but answer ii. seems obvious. I also include i. if a local charge can be induced on the strip in question. This will happen if it is conductive.

Cheers

7. I agree with william. And it's actually not so hard to induce a charge in a conductor. There's an electricty machine which I think is called Wilson's machine that uses this to create sparks of several feet.

8. say im a junior in highshool, would such an explination that it is 1 and 2 be too advanced for me. im just in a normal physics class

9. Originally Posted by european SENS
say im a junior in highshool, would such an explination that it is 1 and 2 be too advanced for me. im just in a normal physics class

Well, I assume the teacher says ii. is the answer and i. is in question.

Does your teacher have a Van de Graaff generator?
If so, take a small piece of tin foil, ball it up around some thread so you have a ball about 1 cm in diameter dangling from the thread.

Hold the ball in your hand so as to ground it (make it neutral).

Turn on the generator, and while holding the thread, bring the (neutral) ball of tin foil near the generator (but don't let the ball touch the generator).

Watch what happens. (And keep in mind that the ball of tin foil is neutral, simulating part i. of this question.)

You could propose this experiment to your teacher.

Cheers

10. yes i believe we do have one of those. i will propose this experiment to my teacher. thank you mr william.

11. Originally Posted by european SENS
yes i believe we do have one of those. i will propose this experiment to my teacher. thank you mr william.

You're very welcome.

 Bookmarks
##### Bookmarks
 Posting Permissions
 You may not post new threads You may not post replies You may not post attachments You may not edit your posts   BB code is On Smilies are On [IMG] code is On [VIDEO] code is On HTML code is Off Trackbacks are Off Pingbacks are Off Refbacks are On Terms of Use Agreement