A charged glass rod is brought close to an insulated metal rod. The rod is momentarily grounded and then the ground is removed. This method of charging is called charging by ______?

There is 3 ways; by friction, by conduction, and by induction. I think is by friction! People what you Think?

The method of charging you are describing is called charging by induction. Let me explain why.

Charging by friction occurs when two objects rub against each other and electrons are transferred from one object to another. This does not involve grounding or the use of a third object.

Charging by conduction involves directly touching a charged object to another object, allowing the charge to transfer between them. Grounding is not necessary in this method.

Charging by induction, on the other hand, involves bringing a charged object near an uncharged object. In this case, the charged glass rod is brought close to the insulated metal rod. When the ground is momentarily connected to the metal rod, it allows the charges in the metal rod to redistribute themselves. The opposite charges are attracted towards the grounded object (in this case, the ground) and the like charges are repelled. After the ground is removed, the metal rod is left with a net charge opposite to the charged glass rod.

So, in this scenario, the correct answer is charging by induction.