Question

If a glass rod is being rubbed with silk, then
A. glass rod: positive charge, silk: positive charge
B. glass rod: negative charge, silk: negative charge
C. glass rod: positive charge, silk: negative charge
D. glass rod: negative charge, silk: positive charge

Answer 1

Hint: The losing of one negative charge from an atom will make it positive. In the same way the losing of one positive charge from an atom will make it negative. The electrons are having a negative charge. Therefore the gain and loss of charges are being told by the movement of these elementary particles known as electrons. This will help you in answering this question.

Complete answer:
When a glass rod is made to be rubbed with silk, the glass happens to lose the electrons very easily and the silk takes them away from the glass atoms. That is when a glass rod is rubbed with the silk material, then the glass rod will attain an extra positive charge. This means that the glass rod is lacking electrons. Hence the electrons will be moving from the glass to silk. Hence after rubbing, the glass rod will become positively charged and the silk will become negatively charged. These positive and negative charges are having equal and opposite charges.

Therefore the correct answer has been mentioned in the question as option C.

Note:
The atom which has lost an electron will become a positively charged ion known as a cation. In the same way, the atom that takes up the extra electron will become a negatively charged ion known as an anion. The opposite charges will be attracting each other. And also the identical charges kept together will repel one another.