Answers

2015-09-28T17:52:10+05:30
A PARTICLE IS CHARGES  WHEN IT LOOSES OR GAIN ELECTRON.
IF  IT LOOSES AN ELECTRON IT IS POSITIVELY  CHARGED ,IF IT GAINS 
IT IS NEGATIVELY CHARGES.WE CAN KNOW WEATHER IT IS NEGATIVELY OR POSITIVELY  CHARGED BY  TAKING IT CLOSE TO A POSITIVELY CHARGED BODY .IF IT REPELS IT IS POSITIVELY  CHARGED ,IF IT ATTRACTS IT IS NEGATIVELY CHARGED.
I HOPE THIS HELPS U...
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2015-09-28T20:53:02+05:30
To test if a body is charged positively or negatively :-
bring another positively charged body near the substance having negative \ positive charge.
If the charge in the body is positive,it will repel the other body having the positive charge.
Hope this helps you as this is the simplest experiment and pls give me the best answer ☺.
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