Plastic straws A and B are rubbed with dry cotton cloth. What will happen, if they are brought near each other?

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Acquire same charge and hence repel each other.

Acquire different charge and repel each other.

Acquire same charge but do not repel each other.

None of these.

answer is A.

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Detailed Solution

Plastic straws A and B are rubbed with dry cotton cloth. If they are brought near each other acquire same charge and hence repel each other.
When two dissimilar materials are rubbed together, electrons from one substance are transferred to the other. As a result, when an object loses an electron, it becomes positively charged, whereas when an object gains an electron, it becomes negatively charged. A positively charged object will draw a negatively charged object, according to our fundamental theory of charge interaction. Things that have opposing charges are drawn to one another. In contrast to the attractive force that exists between two items with opposing charges, two objects with the same charge repel one another. Because the plastic straws and cotton fabric receive the same charge when they are rubbed together and the same charges repel, when plastic straws A and B are rubbed with a dry cotton cloth, they will repel one another.

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