An ebonite rod rubbed with fur attracts a glass rod rubbed with silk because
Answer Details
When two objects are rubbed against each other, they can become electrically charged. This happens because the rubbing causes electrons to transfer from one object to the other. One object loses electrons and becomes positively charged, while the other gains electrons and becomes negatively charged.
In this case, when the ebonite rod is rubbed with fur, it gains electrons and becomes negatively charged. When the glass rod is rubbed with silk, it loses electrons and becomes positively charged.
Opposite charges attract each other, so the negatively charged ebonite rod and positively charged glass rod will be attracted to each other. Therefore, the correct answer is that the ebonite rod has a negative charge while the glass rod has a positive charge.