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i Safari File Edit View History Bookmarks Window Help 33% D !" Mon 8:56 PM a : s1.lite.msu.edu Main Menu Contents Grades … » Hw 01 (Jan. 22) » Charges on metal balls (-) Timer Notes Evaluate 4 Feedback-Print Course Contents Charges on metal balls Five small identical metal balls are hung from insulating silk threads and are handled only by the threads. They are not allowed to touch one another during the following experiment. It has previously been found that none of the balls are affected by a magnet. The balls are brought near each other, and the following observations are recorded: 1. Metal balls I and V exert no force on each other. 2. Metal balls IV and II repel each other. 3. All other pairs of metal balls attract one another. For example, ball IV attracts balls I, III, and V IV In which pairs of balls do both carry charge of the same sign? Determine for each of the following statements whether it is correct or incorrect. CorectIV and II; incorrect I and V; Correct IncorrectII and V; CorrectI and II Submit Answer IV and I correct. Tries 6/12 Previous Tries Which of the following pairs contain one ball of each charge? Determine whether each statement is correct or incorrect. IV and I III and V; IV and v; IV and III 1 and Submit Answer Tries 0/12 Export NEW Anonymous 1 Reply (Sun Jan 21 08:27:07 pm 2018 (EST)) How do you do part b, because if every pairing attracts except for 1 and 5, and 2 and 4, then everything would be correct except for the pairing of 2 and 4. It is saying this is wrong though NEW Re: Conor Mckinney Reply (Sun Jan 21 09:54:03 pm 2018 (EST)) I think you have your roman numerals mixed up, Balls 2 and 5 repel each other, and balls 4 and 1 do not exert a force (no charge)Explanation / Answer
Ball 1 and 5 exert no force on each other. So obvious they are electrically neutral. Now as they are metal balls, they can be attrated by other charged balls, as due to presence of a charged ball, in a neutral metallic ball, the opposite charges move to side near the charged ball and hence there is an attractive force between them.
Balls 2 and 4 repel each other. So they are of same charges.
As all other pairs attract each other, so ball 3 is of different charge than ball 2 and ball 4.
Finall conclusion is:-
Ball 1 and Ball 5 are neutral
Ball 2 and Ball 4 have same charge
Ball 3 has opposite charge
in part (a) of the question, first two options are correct.
in part (b) of the question, 4th option(i.e. iv and iii) is correct
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