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Some Qustions of Electrostatic Induction

  • #1
Hi


Q 1 An electrified rod attracts pieces of paper. After a while these papers fly away. Why?

My Answer: Due to the phenomenon of electrostatic induction, the paper becomes charged and will be attracted towards the rod. After some time, the charge becomes neutral and paper flies.

Q 2 How much negative charge has been removed from a positively charged electroscope if it has a charge of 7.5 x 10-11 C?

My Answer: According to phenomenon of electrostatic induction, the amount of charge induces will be equal to amount of charge displaced. So - 7.5 x 10-11 C has been removed from a positively charged electroscope if it has a charge of 7.5 x 10-11 C.

Q 3 Rubber tires get charged from friction with the road. What is the polarity of the charge?

My Answer: Tires will acquire negative charges due to friction between Earth and tires. Electrons are transferred from Earth to rubber tires.

Q 4 Explain why, a glass rod can be charged by rubbing when held by hand but an iron rod can’t be charged by rubbing, if held by hands?

My Answer: Since glass is an insulator so when it is charged by rubbing, charges doesn’t move towards earth via human body. While iron is a conductor so when it is charged by rubbing, charges move towards the earth via human body.


Guide me in this regard.

Riz
 
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Answers and Replies

  • #2
831
12
I'm not sure about the second but all the other ones are correct.
 
  • #3
Two is also right, but it is the law of conservation of charge.
 

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