MCQ
The current conduction in a discharged tube is due to
- AElectrons only
- B$+ve$ ions and electrons
- C$-ve$ ions and electrons
- ✓$+ ve$ ions, $-ve$ ions and electrons
✓
Answer
Correct option: D.
$+ ve$ ions, $-ve$ ions and electrons
d
In general Ions are always present in gases due to cosmic rays and many other factors. so when we apply a potential difference across the discharge tube the ions get accelerated due to electric field. if this potential difference is large enough then these iron gets enough energy to ionize the molecule on collision. Thus a large number of Ions are produced and conduction starts. Generally an electron gets detached from a molecule to form a positive ion and at a low pressure these electrons move through a large distance and gets attracted to another molecule and thus froms the negative ion so we can say during the conduction electrons, positive ions and negative ions takes part.
In general Ions are always present in gases due to cosmic rays and many other factors. so when we apply a potential difference across the discharge tube the ions get accelerated due to electric field. if this potential difference is large enough then these iron gets enough energy to ionize the molecule on collision. Thus a large number of Ions are produced and conduction starts. Generally an electron gets detached from a molecule to form a positive ion and at a low pressure these electrons move through a large distance and gets attracted to another molecule and thus froms the negative ion so we can say during the conduction electrons, positive ions and negative ions takes part.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A circuit connected to an $ac$ source of $emf$ $e = e_0\, sin\, (1000t)$ with $t$ in seconds, gives a phase difference of $\frac{\pi }{4}$ between the $emf$ $e$ and current $i$. Which of the following circuits will exhibit this?
→In a capacitor of capacitance 20 μF, the distance between the plates is 2mm. If a dielectric slab of width 1mm and dielectric constant 2 is inserted between the plates, then the new capacitance is
Both the diodes used in the circuit shown are assumed to be ideal and have negligible resistance when these are forward biased. Built in potential in each diode is $0.7\; \mathrm{V} .$ For the input voltages shown in the figure, the voltage (in $Volts$) at point $A$ is
→When a potential difference is applied across, the current passing through
As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity:
The terminal voltage across a battery of $\mathrm{emf}$ $E$ can be
→A uniform wire of 16 Ω is made into the form of a square. Two opposite corners of the square are connected by a wire of resistance 16 Ω. The effective resistance between the other two opposite corners is
If the plates of a parallel plate charged capacitor are not parallel, the interface charge density is:
In Bohr’s model of hydrogen atom, which of the following pairs of quantities are quantized
The resistance of a discharge tube is
Ohmic
Ohmic