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The electroscope is a device for detecting electric charge on an object.
The two gold leaves are uncharged and lie close to each other. Charge a glass rod by rubbing its one end with a piece of silk cloth. Touch the charged glass rod with the top end of metal clip. We will see that the two aluminium leaves moves away from each other (open up).
When we touch the top end of metal clip with the positively charged glass rod, then some of its positive charge is transferred to the top end of metal clip.
Metal clip conducts the positive charge to the two aluminium leaves held on its other end.
This way, the two aluminium leaves get charged with the same kind of electric charge-positive charge and similar charges repel each other.
Greater the amount of electric charge of an object, greater the aluminium leaves will diverge. If an object is uncharged (having no electric charge) then the aluminium leaves will not diverge at all.