About a century ago Charles Du Fay of France discovered that , there are two types of charges (i) positive charge & (ii) negative charge.
Benjamin Franklin (1706-1790) an american scientist said that the charge developed on a glass rod when rubbed with silk is called positive charge & the charge developed on a plastic rod when rubbed with wool is called negative charge.....this convention consist a fact that when two equal and opposite charge are brought in contact with each other will cancel each other hence the chage on the electron is neutral...and this convention is taken as the present day convention.
FUNDAMENTAL LAW OF CHARGE: like charge repell each other & unlike charge attract each other , this property of charge is known as fundamental law of charge
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