A silk cloth gains electrons when rubbed over a glass rod. A different glass rod gains electrons when rubbed with rabbit fur. What will happen if the two charged glass rods approach one another and why? A. The rods will repel each other because they have unlike charges. B. There will be no reaction between the rods. C. The rods will attract each other because they are both positively charged. D. The rods will attract each other because they have unlike charges. E. The rods will repel each other because they have like charges.
Question
A silk cloth gains electrons when rubbed over a glass rod. A different glass rod gains electrons when rubbed with rabbit fur. What will happen if the two charged glass rods approach one another and why? A. The rods will repel each other because they have unlike charges. B. There will be no reaction between the rods. C. The rods will attract each other because they are both positively charged. D. The rods will attract each other because they have unlike charges. E. The rods will repel each other because they have like charges.
Solution
E. The rods will repel each other because they have like charges.
Here's why: When a silk cloth is rubbed over a glass rod, the glass rod tends to lose electrons and becomes positively charged. Similarly, when a glass rod is rubbed with rabbit fur, the glass rod again tends to lose electrons and becomes positively charged.
When two objects are charged in the same way, they have "like charges." According to the basic principles of electromagnetism, like charges repel each other. Therefore, when the two positively charged glass rods approach each other, they will repel each other.
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