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The electric current in a discharge tube containing a gas is due to
  • a)
    electron only
  • b)
    positive ions only
  • c)
    negative ion and positive ions both
  • d)
    electrons and positive ions both
Correct answer is option 'D'. Can you explain this answer?
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The electric current in a discharge tube containing a gas is due toa)e...
Thus, intensive recombinations of electrons and positive ions into neutral atoms and molecules occur. This results in the emission of light by the discharge, i.e., the negative glow is mainly due to a glow of recombination. Hence in electric discharge the electric current is due to both electrons and positive ions.
 
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The electric current in a discharge tube containing a gas is due toa)e...
Electric Current in a Discharge Tube

Introduction: A discharge tube is a glass tube containing a gas at low pressure. When an electric potential difference is applied across the tube, a discharge of electricity occurs through the gas. The nature of the discharge depends on the gas and the voltage applied.

Electric current in a discharge tube: The electric current in a discharge tube containing a gas is due to the movement of charged particles. The charged particles present in the discharge tube are:

- Electrons
- Positive ions
- Negative ions

Role of electrons: Electrons are negatively charged particles. They are produced by the ionization of gas molecules by collisions with other electrons or by the voltage applied across the tube. The electrons move towards the positively charged electrode (anode) and constitute an electric current.

Role of positive ions: Positive ions are formed when a gas molecule loses an electron. They are attracted towards the negatively charged electrode (cathode) and contribute to the electric current.

Role of negative ions: Negative ions are formed when a gas molecule gains an electron. They are attracted towards the positively charged electrode (anode) and contribute to the electric current.

Conclusion: Thus, the electric current in a discharge tube is due to the movement of both electrons and positive ions. Negative ions also contribute to the current, but their role is relatively minor.
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The electric current in a discharge tube containing a gas is due toa)e...
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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 charge d) 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 exampl e) 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?

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 charge d) 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 exampl e) 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.

The electric current in a discharge tube containing a gas is due toa)electron onlyb)positive ions onlyc)negative ion and positive ions bothd)electrons and positive ions bothCorrect answer is option 'D'. Can you explain this answer?
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