Three plastic balls are suspended from insulating threads. Several experiments a
ID: 2252791 • Letter: T
Question
Three plastic balls are suspended from insulating threads. Several experiments are performed on the balls to determine the charge on them; and the following observations are made:
I) Ball A attracts Ball B.
II) Ball A and Ball B attract Ball C.
III) A positively charged rod attracts B.
Which choice of charge configurations (a through e) correctly identifies the charges on each ball?
The answer is not b. Please give full explanation.
Three plastic balls are suspended from insulating threads. Several experiments are performed on the balls to determine the charge on them; and the following observations are made: Ball A attracts Ball B. Ball A and Ball B attract Ball C. A positively charged rod attracts B. Which choice of charge configurations (a through e) correctly identifies the charges on each ball?Explanation / Answer
concept used : like repel, opposites attract.
Positive rod attracts B. Thus B is negatively charged.
A attracts B. Thus A is positively charged.
A and B, both attract C. thus C is neutral. the attraction is due to induced charges.
Thus A is +, B is - and C is 0.
option c is correct.
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