A gold-leaf type electroscope is a device used to detect the presence of electric charge on a body and its relative amount . ... These are a safety measure; if an excessive charge is applied to the delicate gold leaves, they will touch the grounding plates and discharge before tearing.
Why do we use a gold leaf Electroscope?
Hint: A gold leaf electroscope is a device that is used to detect the presence of charge on an object and also determine the nature of charge present . It has two gold plated strips that are called leaves that can be charged when a charged body is kept in contact with the cap that connects the two leaves.
Why are gold leaves used in gold leaf Electroscope?
Gold is not the only metal used in electroscope. ... A reason why these metals are used is that they are malleable more than any other metal . To use the electroscope, you need to put a thin trey into it. Another reason, which is not the best and is not quiet sure to me, is that Gold is less reactive.
Why are gold or Aluminium leaves used in an electroscope?
A gold leaf electroscope does not have aluminium foil, its made of gold foils. Now aluminium is also good conductor of electricity and charge . So it is far easier to make a aluminium foil electroscope to check the way an electroscope work or detect electrostatic charge.
Why brass is used in gold leaf Electroscope?
Name the material that is used in the preparation of stem of the a gold leaf electroscope. In a gold-leaf electroscope, its stem is made up of brass . Brass is an alloy of copper and zinc. The combination of these metals makes the brass solid and robust.
Which metal is used in gold leaf electroscope?
The gold-leaf electroscope was developed in 1787 by British clergyman and physicist Abraham Bennet, as a more sensitive instrument than pith ball or straw blade electroscopes then in use. It consists of a vertical metal rod, usually brass , from the end of which hang two parallel strips of thin flexible gold leaf.
Why does the gold leaf fall?
Light of a specific frequency is shone onto the metal plate. If the light is of a sufficiently high frequency, electrons are emitted from the metal plate. This is seen macroscopically: the gold leaf and rod get closer together as they become less negatively charged, and so repel less .
How do you charge a gold-leaf electroscope positively?
Leaves will spread out more and more as they gain more and more charge, whether positively or negatively charged. – Charging by induction : Place the object near to the electroscope, the electroscope top knob will acquire the opposite charge of the object at hand. Strips will then have the same charge as the object.
What is the principle of gold-leaf electroscope?
A gold-leaf electroscope is a simple device which is used to identify the electric charge present in a body. Their operation is based on the principle of like sign charge repulsion . When the leaves, which are electrically connected, become electrically charged, they push apart from each other.
How can a gold-leaf electroscope be charged?
The electroscope can be charged in two ways: (a) by contact – a charged rod is touched on the surface of the disc and some of the charge is transferred to the electroscope. This is not a very effective method of charging the electroscope.
Why did we use aluminum foil or gold leaf inside the jar and not plastic in electroscope?
It is necessary to have two pieces of foil or gold leaf touching so that they can repel each other when the electrons flow into them . ... The electrons, which are negatively charged, can then travel through the copper wire of the electroscope down to the pieces of foil, which both become negatively charged.
Can we use leaves of some other metal instead of gold in the electroscope?
Your Answer :- Yes, We can use Aluminium leaves Also .
We can also use Aluminum instead of gold leaves in the electroscope. We can make a very thin sheet of gold as well as aluminum , because we know that the electroscopic force b/w small amount of charges is very small.
What is the working of electroscope?
WORKING OF AN ELECTROSCOPE :
When a charged object touches the metal knob, electric charges travel down the rod and into the leaves . The leaves spread apart, indicating the presence of an electric charge. Since the charge on both leaves is the same the leaves repel each other and spread out.
Who invented electroscope?
William Gilbert , an English physician and renowned author of De Magnete (“On the Magnet”), built an early form of the electroscope in the early 17th century. His device, dubbed the versorium, consisted of a lightweight needle balanced on a pivot. The presence of electricity in a nearby object caused the needle to move.
How do you test an electroscope?
To test the Electroscope, use a small piece of vinyl and rub it for a few seconds with the palm of your hand , then move this piece close to the copper wire edge. Watch how the aluminium pieces spread apart!
What happens when a positively charged object touches an electroscope?
If you bring a positive object near the electroscope, it will attract the electrons toward the terminal . The leaves will move away from each other. You can also use this process with a positive object to charge the electroscope.
