Question

What happens when a glass rod is rubbed with silk cloth ?

• A. the electrons flow from glass rod to silk cloth
• B. the glass rod becomes a negatively charged body
• C. the glass rod becomes a positively charged body
• D. both (a ) and (c)

Answer 1

The correct option is D

both (a ) and (c)

The explanation for the correct option:

Option D

1. Here the concept used is static electricity which is developed by a phenomenon known as charging by friction i.e when two objects are rubbed against each other it leads to the imbalance in the electric charges that results in the flow of electrons
2. When a glass rod is rubbed with a silk cloth, the glass has free electrons on the surface which are transferred to the silk cloth. Thereby, the glass rod loses its electrons and electrons flow from the glass rod to the silk cloth.
3. Since the glass rod loses its electrons it gains a positive charge.
4. Therefore option A and option C both are correct

The explanation for the incorrect option:

Option B

1. A glass rod loses its electrons when rubbed with silk cloth gaining a positive charge, to become negatively charged glass rod should gain electrons this occurs when a glass rod is rubbed with acetate.

Hence option D is correct