Electric Charges and Fields Test 14

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Electric Charges and Fields Test 14

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Weekly Quiz Competition

Question 1
1 / -0

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?

A
A. Plastic

B
B. Glass

C
C. Copper

D
D. Wood

Solution

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.
Question 2
1 / -0

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 ?

A
A. The same as the lightning

B
B. Half that of the lightning

C
C. Zero

D
D. A quarter of the lightning

Solution

The field within a conductor cancels out with any external fields, so the electric field within the enclosure is zero.
Question 3
1 / -0

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.

A
A. low

B
B. high

C
C. no

D
D. medium

Solution

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.
Question 4
1 / -0

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?

A
A. Both negative

B
B. Both positive

C
C. Hair will be positively charged, Amber will be negatively charged.

D
D. Hair will be negatively charged, Amber will be positively charged.

Solution

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.
Question 5
1 / -0

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.

A
A. negatively, negatively

B
B. positively, positively

C
C. positively, negatively

D
D. negatively, positively

Solution

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.
Question 6
1 / -0

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:

A
A. car

B
B. plastic box

C
C. lighting rod

D
D. metal rod

Solution

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.
Question 7
1 / -0

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.

A
A. Ebonite, Nylon

B
B. Plastic wrap, Teflon

C
C. Nylon, cat fur

D
D. Steel, wood

Solution

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.
Question 8
1 / -0

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

A
A. By contact

B
B. Without contact

C
C. By any one of the above

D
D. By none of the above

Solution

The process of electron transfer as a result of two objects coming into contact with one another and then separating is called triboelectric charging.
Question 9
1 / -0

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 :

A
A. 1.9 × 10⁵ Nm²/C entering the surface.

B
B. 1.9 × 10⁵ Nm²/C leaving the surface.

C
C. 2.0 × 10⁵ Nm²/C leaving the surface.

D
D. 2.0 × 10⁵ Nm²/C entering the surface.

Solution

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^–12C²/Nm²
∴ Q/ε₀ = 2.2 × 10⁵C²/Nm²
Question 10
1 / -0

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 :

A
A. Zero

B
B. +q

C
C. –q

D
D. +2q

Solution

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.