Question

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?

Answer 1

If i remember right, things of this sort are usually charged by induction.

Answer 2

Grounding the object removes its charge. After this the "chargeless" rod will induce an interaction between the two rods, effectively getting some sort of charge back.

Answer 3

So looks like is induction right?

Answer 4

Yeah. I would assume you can rule out friction because the items are only brought "close" not in contact with each other. and conduction usually implies an outside voltage source to charge a material.

Answer 5

At the end of the procedure the sign of the charges on the metal rod and the glass rod are ?

Answer 6

Positive on the metal rod, negative on the glass rod.

Answer 7

http://www.splung.com/content/sid/3/page/electrostatics
If you click on this link look at the first image shown next to "charging by induction". It shows the process that your question is asking about. It appears a better description of what is happening is that the charged glass rod pushes the opposing charge to the opposite end and when you ground it, the ground carries these negative charges away. I believe this is because the Earth can be treated as an insulator with excess positive charge so it will always draw out the negative charge from objects. This is why when you ground objects in circuits your voltage drops to zero.

Answer 8

thanks burton

Answer 9

Anytime, good luck.