1.Does electron has a charge 3.2*10^-19 C less than charge of proton.2.Why does a phonograph -record attract dust particles just after it is cleaned?3.Comment 4 pie lines of force originate from each unit positive charge rather 4 pie is not an integer.4.does paper become charged when a charged comb is brought near small pieces of paper get attracted by it.

Dear Vikash,

1.There are two kinds of charges. It was a historical accident to name one of it + and the other -

The ancient name for + was vitreous and that of – was resinous.

The magnitude of charge for proton and electron are the same but the nature of charge is different.

2.the rubbing on some surfaces make them charge..

 phonograph-record is one of them.....

static charges appear on the disk as they r rubbed.... other ex are comb, plastic chairs (beaten up by toowel) etc.

these charges attract dust particles( -ve charges, usually)...........!!!

soon after cleaning..!!!

Best Of luck

Cracking IIT just got more exciting,It s not just all about getting assistance from IITians, alongside Target Achievement and Rewards play an important role. ASKIITIANS has it all for you, wherein you get assistance only from IITians for your preparation and win by answering queries in the discussion forums. Reward points 5 + 15 for all those who upload their pic and download the ASKIITIANS Toolbar, just a simple  to download the toolbar….

So start the brain storming…. become a leader with Elite Expert League ASKIITIANS

Thanks

Aman Bansal

Askiitian Expert