Question

What will be the change in the radius of a soap bubble if it is given positive charge?
A) The radius will decrease
B) The radius will remain unchanged
C) The radius may increase or decrease
D) The radius will increase

Answer 1

We need to remember that the soap is made up of soapy liquid and is dipped in water. The soap bubble depends on the pH of the water. It also depends on the mineral ions in the water. There are two types of water. This classification is based on the types of minerals present in the water.

Complete answer:
The radius of a soap bubble is inversely proportional to the surface tension of the soap bubble.
If the radius of a soap bubble is increased to the surface tension of the soap bubble will decrease. On the other hand the radius of a soap bubble decreases so the surface tension of the soap bubble will increase.
The negative or positive charge of the soap bubble, the surface tension of the soap bubble will increase and the radius of a soap bubble decreases.
According to the above discussion, we conclude the change in the radius of a soap bubble if it is given positive charge will decrease.
Hence,
Option A is the correct answer, because the change in the radius of a soap bubble if it is given positive charge will decrease.
Option B is not a correct answer, because the change in the radius of a soap bubble if it is given positive charge is not a will remain unchanged
Option C is not a correct answer, because the change in the radius of a soap bubble if it is given positive charge is not a may be increase or decrease
Option D is not a correct answer, because the change in the radius of a soap bubble if it is given positive charge is not a decrease increase.

So, the correct answer is “Option A”.

Note:
We have to remember that the hard water and soft water are the two types of water. The molecular formula of water is ${H_2}O$. The molecular weight of water is $18$. Water can exist in all the three forms. In solid, water is called ice. The gaseous form of water is called water vapour.