The gold leaf electroscope
Gold Leaf electroscope..
It is a simple apparatus with which the presence of electric charge on a body is detected (see figure). When metal knob is touched with a charged body, some charge is transferred to the gold leaves, which then diverges due to repulsion. The separation gives a rough idea of the amount of charge on the body. If a charged body brought near a charged electroscope the leaves will further diverge. If the charge on body is similar to that on electroscope and will usually converge if opposite. If the induction effect is strong enough leaves after converging may again diverge.
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The gold leaf electroscope has a very very thin piece of
gold foil (called gold leaf) fixed at the top to a piece of copper. The copper has a large round top, called the cap.
The whole thing is put inside a glass case,
to stop air blowing the delicate gold leaf around.
The piece of copper goes through insulation in the top of the glass case, so that any charge on the gold leaf cannot escape. INVENTOR OF THE GOLD-LEAF ELECTROSCOPE:-
Englishmen Sir Abraham Bennet (1786 Anno Domini)
PRINCIPLE OF A GOLD-LEAF ELECTROSCOPE:-
A gold-leaf electroscope is a simple device which is used to identify the electric charge present in a body. CONSTRUCTION OF A GOLD-LEAF ELECTROSCOPE:-
1) A gold-leaf electroscope is a metallic disk attached to one end of a copper rod. 2) To the other end of the copper rod, two thin gold metal leaves are attached. (Usually of gold. Can also be of another metal.) 3) The side of the copper rod with the thin gold leaves is fitted inside a conical flask, through a non-conducting rubber-cork. 4) The thin gold leaves are used in a electroscope to make it more sensitive. WORKING OF A GOLD-LEAF ELECTROSCOPE:-
1) If an uncharged body is brought and touched on the metallic disk, we notice no change in the golden leaves. 2) If a charged body (positively or...
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