Electrostatics(in hurry)10mark

Following the electrostatic series, when a glass is rubbed with a piece of silk cloth, the glass rod acquires positive charges, whereas the silk cloth acquires negative charges.
Iron is itself an electrical conductor. When the positively charged glass rod is brought near the iron filings, any induced charges on the filings will be conducted away (to earth) rapidly. There will not be any net charge on the filings, and thus attraction will not occur.

When glass rod is rubbed wuth silk, some negative charge from the glass rod is transferred to the silk The silk has excess negative charge and the glass rod has excess positive charges. Which mean that the glass rod has positive charges and the silk has negative charges.
The iron filings which are made of iron, which is a kind of metal. In a metal, each atoms give up its outer shell electrons to beacome a positive ion. These electrons move and occupy the spaces between the ions. The moving electrons are called mobile electrons.
While the iron as well as the glass rod is positivly charged, they will repelled each other.