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Three objects are brought close to one another, two at a time. When objects A and B are brought together, they attract. When objects B and C are brought together, they repel. Which of the following are necessarily true? (a) Objects A and C possess charges of the same sign. (b) Objects A and C possess charges of opposite sign. (c) All three objects possess charges of the same sign. (d) One object is neutral. (e) Additional experiments must be performed to determine information about the charges on the objects.
Physics for Scientists and Enginee...
Solutions
Physics for Scientists and Enginee...
Three objects are brought close to one another, two at a time. When objects A and B are brought together, they attract. When objects B and C are brought together, they repel. Which of the following are necessarily true? (a) Objects A and C possess charges of the same sign. (b) Objects A and C possess charges of opposite sign. (c) All three objects possess charges of the same sign. (d) One object is neutral. (e) Additional experiments must be performed to determine information about the charges on the objects.
The statements that are necessarily true.
Explanation of Solution
According to properties of electric charge, the charges with the same sign always experience a repulsive force on each other due to which the charges with same sign repel each other and the charge with the opposite charges attracts each other as they experience a force of attraction.
Conclusion:
For A and B to attract each other both of them should either be of opposite charge or one of them must be neutral. But since B repels C, it must be charged. Thus, there is need of carrying the additional experiment for the determination of the charge of the object which can be neutral or charged. Thus, option (e) is correct.
The objects A and B are of opposite sign or one of them may be neutral as they attract each other...
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