Question

On a dry day, a balloon is rubbed against a wool sweater. When the balloon is then brought close to a wood wall, the balloon is attracted to the wall. Which of the following statements is true about this process? Select the correct answer
Only new negative charges were created by rubbing the balloon, giving it a net negative charge
only new positive charges were created by rubbing the balloon, giving it a net positive charge.
The wood wall must be covering a metal wall behind it.
The balloon has a net charge on it, but the wall may be neutral (have no net charge).
Net charge must be transferred from the balloon to the wall in order for them to stick together

Answer 1

Answer: For the given process it is true that the balloon has a net charge on it, but the wall may be neutral (have no net charge).

Explanation:

When we tend to rub a balloon against a woolen sweater then it is possible that the balloon might stick to the wall. This might be due to the increase in number of electrons on the balloon and the wall gets positively charged.

Since, opposite charges tend to attract each other hence, the balloon will stick to the wall.

A neutral object also tends to acquire a certain charge when it is rubbed by a charged object.

Therefore, we can conclude that the balloon has a net charge on it, but the wall may be neutral (have no net charge).