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Q1) state 2 uses of electroscope

Q2) TV screens become dusty very soon.why?

Q3) why is the upper end of the lightning conductor is made into a trishul?

(respected experts pls fast ai have a test on monday)

uses of electroscope

I can think of three: 1) It can be used to detect high Voltage. When charged, the leaves separate because like charges repel. 2) It can be used to detect radioactivity. When subjected to strong ionizing radiation, it will discharge the device, so the leaves will fold together since the charge bleeds off. It is assumed that the insulation is perfect. Also, humidity in the air will tend to bleed off the charge over time. - it is not a very sensitive radioactivity detector - do NOT count on it to warn you of dangerous levels of radiation!

3) For determining the polarity of a high Voltage. (Charge it with the unknown, then bring it close to another high Voltage of known polarity and see if the leaves stay apart or if they collapse.)

2.Static electricity builds up on the screen of the television which gives the screen a + charge, It becomes a cathode. The now "charged" screen will now attract particles of dust consisting of anions (- ions). Over a period of time a thick layer of dust will form.

3.The sharp point on a lightning rod tends to allow electrical charges to flow easily off the rod and into the atmosphere. Ideally, the gradual flow of charge from the point of the lightning rod will prevent the atmosphereic charge from becoming large enough to avalanche... producing a lightning stroke.

On the otherhand, a lightning rod provides the most likely point for lightning to strike because a lightning strike always follows the path of least reisistance, and the lightning rod provides just such a path.

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uses of electroscope

I can think of three: 1) It can be used to detect high Voltage. When charged, the leaves separate because like charges repel. 2) It can be used to detect radioactivity. When subjected to strong ionizing radiation, it will discharge the device, so the leaves will fold together since the charge bleeds off. It is assumed that the insulation is perfect. Also, humidity in the air will tend to bleed off the charge over time. - it is not a very sensitive radioactivity detector - do NOT count on it to warn you of dangerous levels of radiation!

3) For determining the polarity of a high Voltage. (Charge it with the unknown, then bring it close to another high Voltage of known polarity and see if the leaves stay apart or if they collapse.)

2.Static electricity builds up on the screen of the television which gives the screen a + charge, It becomes a cathode. The now "charged" screen will now attract particles of dust consisting of anions (- ions). Over a period of time a thick layer of dust will form.

3.The sharp point on a lightning rod tends to allow electrical charges to flow easily off the rod and into the atmosphere. Ideally, the gradual flow of charge from the point of the lightning rod will prevent the atmosphereic charge from becoming large enough to avalanche... producing a lightning stroke.

On the otherhand, a lightning rod provides the most likely point for lightning to strike because a lightning strike always follows the path of least reisistance, and the lightning rod provides just such a path.

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1. they are mainly used to detect charges, whether it is positive, negative or neutral

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