Three are brought close to each other, two at a time. When objects A and B are b

Question

Three are brought close to each other, two at a time. When objects A and B are brought together, they attract. When objects B and C are brought together, they repel. From this, we conclude which of the following? (Select all that apply.) All three of the objects possess charges of the same sign. We need to perform additional tests to determine information about the charges on the objects. Objects A and C possess charges of the same sign. Objects A and C possess charges of opposite sign. One of the objects is neutral.

Explanation / Answer

Similar charges attract where as opposite sign charges repel each other.

A and B attract , hence charge on A and C are of opposite sign.
B and C repel, Charges on B and C are of same sign.
We conclude from this that, charges on A and C are of opposite sign.

Hence fourth statement, ' Objects A and C possess charges of opposite sign' is correct
Second statement, ' we need......... ' may also be taken as correct statement. From given information all we get is , B and C are of same sign and A is of opposite sign, but we can't tell, If A, B and C possess, -ve or +ve charge

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