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# Case Based Questions Test: Electric Charges & Fields

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## 10 Questions MCQ Test Physics Class 12 | Case Based Questions Test: Electric Charges & Fields

Case Based Questions Test: Electric Charges & Fields for NEET 2023 is part of Physics Class 12 preparation. The Case Based Questions Test: Electric Charges & Fields questions and answers have been prepared according to the NEET exam syllabus.The Case Based Questions Test: Electric Charges & Fields MCQs are made for NEET 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Case Based Questions Test: Electric Charges & Fields below.
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Case Based Questions Test: Electric Charges & Fields - Question 1

### Read the following text and answer the following questions on the basis of the same:Faraday Cage: A Faraday cage or Faraday shield is an enclosure made of conducting material. The fields within a conductor cancel out with any external fields, so the electric field within the encloser is zero. These Faraday cages act as big hollow conductors you can put things in to shield them from electrical fields. Any electrical shocks the cage receives, pass harmlessly around the outside of the cage.Which of the following materials can be used to make a Faraday cage?

Detailed Solution for Case Based Questions Test: Electric Charges & Fields - Question 1 A Faraday cage or Faraday shield is an enclosure made of a conducting material. Since copper is the only metal given in the list of options, copper is the correct answer.
Case Based Questions Test: Electric Charges & Fields - Question 2

### Read the following text and answer the following questions on the basis of the same:Faraday Cage: A Faraday cage or Faraday shield is an enclosure made of conducting material. The fields within a conductor cancel out with any external fields, so the electric field within the encloser is zero. These Faraday cages act as big hollow conductors you can put things in to shield them from electrical fields. Any electrical shocks the cage receives, pass harmlessly around the outside of the cage.What is the electrical force inside a Faraday cage when it is struck by lightning ?

Detailed Solution for Case Based Questions Test: Electric Charges & Fields - Question 2 The field within a conductor cancels out with any external fields, so the electric field within the enclosure is zero.
Case Based Questions Test: Electric Charges & Fields - Question 3

### Read the following text and answer the following questions on the basis of the same:Tribo-electric series: The tribo-electric series is a list that ranks materials according to their tendency to gain or lose electrons. The process of electron transfer as a result of two objects coming into contact with one another and then separating is called tribo-electric charging. During such an interaction, one of the two objects will always gain electrons (becoming negatively charged) and the other object will lose electrons (becoming positively charged). The relative position of the two objects on the tribo-electric series will define which object gains electrons and which object loses electrons.In tribo-electric series, materials are ranked from high to low in terms of the tendency for the material to lose electrons. If an object high up on this list (Glass, for example) is rubbed with an object low down on the list (Teflon, for example), the glass will lose electrons to the teflon. The glass will, in this case, become positively charged and the teflon will become negatively charged. Materials in the middle of the list (steel and wood, for example) are items those do not have a strong tendency to give up or accept electrons.Materials in the upper position has _____ tendency to become positively charged.

Detailed Solution for Case Based Questions Test: Electric Charges & Fields - Question 3 In tribo-electric series, materials are ranked from high to low in terms of the tendency for the material to lose electron i.e. they are ranked high to low tendency of getting positively charged.
Case Based Questions Test: Electric Charges & Fields - Question 4

Read the following text and answer the following questions on the basis of the same: Tribo-electric series: The tribo-electric series is a list that ranks materials according to their tendency to gain or lose electrons. The process of electron transfer as a result of two objects coming into contact with one another and then separating is called tribo-electric charging. During such an interaction, one of the two objects will always gain electrons (becoming negatively charged) and the other object will lose electrons (becoming positively charged). The relative position of the two objects on the tribo-electric series will define which object gains electrons and which object loses electrons.

In tribo-electric series, materials are ranked from high to low in terms of the tendency for the material to lose electrons. If an object high up on this list (Glass, for example) is rubbed with an object low down on the list (Teflon, for example), the glass will lose electrons to the teflon. The glass will, in this case, become positively charged and the teflon will become negatively charged. Materials in the middle of the list (steel and wood, for example) are items those do not have a strong tendency to give up or accept electrons.

If human hair is rubbed with amber, how those will be charged?

Detailed Solution for Case Based Questions Test: Electric Charges & Fields - Question 4 Since human hair is placed at the upper portion of the list, it will leave electrons and will be positively charged. Since amber is placed at the lower portion of the list, it will accept the electron and will be negatively charged.
Case Based Questions Test: Electric Charges & Fields - Question 5

Read the following text and answer the following questions on the basis of the same:

Tribo-electric series: The tribo-electric series is a list that ranks materials according to their tendency to gain or lose electrons. The process of electron transfer as a result of two objects coming into contact with one another and then separating is called tribo-electric charging. During such an interaction, one of the two objects will always gain electrons (becoming negatively charged) and the other object will lose electrons (becoming positively charged). The relative position of the two objects on the tribo-electric series will define which object gains electrons and which object loses electrons. In tribo-electric series, materials are ranked from high to low in terms of the tendency for the material to lose electrons. If an object high up on this list (Glass, for example) is rubbed with an object low down on the list (Teflon, for example), the glass will lose electrons to the teflon. The glass will, in this case, become positively charged and the teflon will become negatively charged. Materials in the middle of the list (steel and wood, for example) are items those do not have a strong tendency to give up or accept electrons.

The object which loses electrons becomes _____ charged and the object gains electrons becomes ______ charged.

Detailed Solution for Case Based Questions Test: Electric Charges & Fields - Question 5 During tribo-electric charging, one of the two objects always gains electrons and become negatively charged. The other object loses electrons and become positively charged.
Case Based Questions Test: Electric Charges & Fields - Question 6

Read the following text and answer the following questions on the basis of the same:

Faraday Cage: A Faraday cage or Faraday shield is an enclosure made of conducting material. The fields within a conductor cancel out with any external fields, so the electric field within the encloser is zero. These Faraday cages act as big hollow conductors you can put things in to shield them from electrical fields. Any electrical shocks the cage receives, pass harmlessly around the outside of the cage.

Example of a real-world Faraday cage is:

Detailed Solution for Case Based Questions Test: Electric Charges & Fields - Question 6 Cars are example of Faraday Cages in the real world. Cars can help keep us safe from lightning. Its metal body acts as a Faraday Cage.
Case Based Questions Test: Electric Charges & Fields - Question 7

Read the following text and answer the following questions on the basis of the same:

Tribo-electric series: The tribo-electric series is a list that ranks materials according to their tendency to gain or lose electrons. The process of electron transfer as a result of two objects coming into contact with one another and then separating is called tribo-electric charging. During such an interaction, one of the two objects will always gain electrons (becoming negatively charged) and the other object will lose electrons (becoming positively charged). The relative position of the two objects on the tribo-electric series will define which object gains electrons and which object loses electrons. In tribo-electric series, materials are ranked from high to low in terms of the tendency for the material to lose electrons. If an object high up on this list (Glass, for example) is rubbed with an object low down on the list (Teflon, for example), the glass will lose electrons to the teflon. The glass will, in this case, become positively charged and the teflon will become negatively charged. Materials in the middle of the list (steel and wood, for example) are items those do not have a strong tendency to give up or accept electrons.

Name two materials which do not have a strong tendency to give up or accept electrons.

Detailed Solution for Case Based Questions Test: Electric Charges & Fields - Question 7 Materials in the middle of the list (steel and wood, for example) are items those do not have a strong tendency to give up or accept electrons.
Case Based Questions Test: Electric Charges & Fields - Question 8

Read the following text and answer the following questions on the basis of the same:

Tribo-electric series: The tribo-electric series is a list that ranks materials according to their tendency to gain or lose electrons. The process of electron transfer as a result of two objects coming into contact with one another and then separating is called tribo-electric charging. During such an interaction, one of the two objects will always gain electrons (becoming negatively charged) and the other object will lose electrons (becoming positively charged). The relative position of the two objects on the tribo-electric series will define which object gains electrons and which object loses electrons. In tribo-electric series, materials are ranked from high to low in terms of the tendency for the material to lose electrons. If an object high up on this list (Glass, for example) is rubbed with an object low down on the list (Teflon, for example), the glass will lose electrons to the teflon. The glass will, in this case, become positively charged and the teflon will become negatively charged. Materials in the middle of the list (steel and wood, for example) are items those do not have a strong tendency to give up or accept electrons.

Tribo-electric charging is the process of electron transfer between two objects

Detailed Solution for Case Based Questions Test: Electric Charges & Fields - Question 8 The process of electron transfer as a result of two objects coming into contact with one another and then separating is called triboelectric charging.
Case Based Questions Test: Electric Charges & Fields - Question 9

Read the following text and answer the following questions on the basis of the same:

Faraday Cage: A Faraday cage or Faraday shield is an enclosure made of conducting material. The fields within a conductor cancel out with any external fields, so the electric field within the enclosure is zero. These Faraday cages act as big hollow conductors you can put things in to shield them from electrical fields. Any electrical shocks the cage receives, pass harmlessly around the outside of the cage.

A point charge of 2 C is placed at centre of Faraday cage in the shape of cube with surface of 9 cm edge. The number of electric field lines passing through the cube normally will be :

Detailed Solution for Case Based Questions Test: Electric Charges & Fields - Question 9 The number of electric field lines passing through the cube normally and leaving the surface = Q/ε0

Q = 2 μC = 2 × 10–6 C

ε0 = 8.85 × 10–12 C2/Nm2

∴ Q/ε0 = 2.2 × 105 C2/Nm2

Case Based Questions Test: Electric Charges & Fields - Question 10

Read the following text and answer the following questions on the basis of the same:

Faraday Cage: A Faraday cage or Faraday shield is an enclosure made of conducting material. The fields within a conductor cancel out with any external fields, so the electric field within the enclosure is zero. These Faraday cages act as big hollow conductors you can put things in to shield them from electrical fields. Any electrical shocks the cage receives, pass harmlessly around the outside of the cage.

If isolated point charge +q is placed inside the Faraday cage. Its surface must have charge equal to :

Detailed Solution for Case Based Questions Test: Electric Charges & Fields - Question 10 If a charge is placed inside an ungrounded Faraday shield without touching the walls of the internal face of the shield it becomes charged with – q, and + q accumulates on the outer face of the shield. If the cage is grounded, the excess charges will be neutralized by the ground connection.

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