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Explain why, a glass rod can be charged by rubbing when held by hand but an iron rod cannot be charged by rubbing, if held by hand?

Q:Explain why, a glass rod can be charged by rubbing when held by hand but an iron rod cannot be charged by rubbing, if held by hand?

 Ans: Glass is an insulator which can be charged by rubbing because charges remain static on its surface. Iron is conductor which cannot be charged by rubbing because charges instantly flow towards the earth by human body or flow towards the iron from earth to make it neutral. Therefore, iron cannot be charged by rubbing.

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