Question

If we rub our dry forearm with a silk cloth, the hairs on the forearm will stand straight. This is because:

• A. of the attraction force between the hairs and the cloth.
• B. of the charge acquired to the forearm due to rubbing.
• C. of the magnetic field created due to rubbing.
• D. none of the above.

Answer 1

Answer: (B)

of the charge acquired to the forearm due to rubbing.

When the forearm is rubbed with a cloth of silk, the dry forearm acquires positive charge. So, all the hairs there acquire same positive charge and repel each other. Thus the hairs stand straight after rubbing.