
Choose the correct answer from the alternative given. The conduction current is the same as displacement current when the source is
A. AC only
B. DC only
C. both AC and DC
D. neither AC nor for DC
Answer
513.9k+ views
Hint: Conduction current is the electric current which exists in a conductor when the electrons flow in the conductor without any change with respect to time.
Displacement current is a quantity which is defined by Maxwell's equations. The rate of change of the electric displacement field (D) is called the displacement current.
Complete step by step solution:
As we know that electric current is defined as the rate of flow of charge through a cross section of the conductor.
The S.I. unit of electric current is Ampere, which is represented as .
For a capacitor we can write for the charge,
Where,
Capacitance of the conductor
Electric potential applied across the capacitor.
As electric current is the rate of flow of charge; so, if Q is changing, there will be a current in capacitor plates,
If voltage across the capacitor is constant,
Then,
It means that, for a Direct Current voltage, the capacitor current is zero. Hence, for a DC source the conduction current and displacement current (capacitor current) are not the same.
If voltage across the capacitor is constant,
Then,
Therefore, by Maxwell's equation for a time varying voltage (AC voltage), both conduction and displacement currents are the same.
Hence, the conduction current and the displacement current will be same if the source of
current is AC.
Note: - In DC source, the polarity of the voltage is constant.
- In DC sources, the polarity of the voltage is not constant.
Displacement current is a quantity which is defined by Maxwell's equations. The rate of change of the electric displacement field (D) is called the displacement current.
Complete step by step solution:
As we know that electric current is defined as the rate of flow of charge through a cross section of the conductor.
The S.I. unit of electric current is Ampere, which is represented as
For a capacitor we can write for the charge,
Where,
As electric current is the rate of flow of charge; so, if Q is changing, there will be a current in capacitor plates,
If voltage across the capacitor is constant,
Then,
It means that, for a Direct Current voltage, the capacitor current is zero. Hence, for a DC source the conduction current and displacement current (capacitor current) are not the same.
If voltage across the capacitor is constant,
Then,
Therefore, by Maxwell's equation for a time varying voltage (AC voltage), both conduction and displacement currents are the same.
Hence, the conduction current and the displacement current will be same if the source of
current is AC.
Note: - In DC source, the polarity of the voltage is constant.
- In DC sources, the polarity of the voltage is not constant.
Latest Vedantu courses for you
Grade 10 | CBSE | SCHOOL | English
Vedantu 10 CBSE Pro Course - (2025-26)
School Full course for CBSE students
₹37,300 per year
Recently Updated Pages
Master Class 12 Business Studies: Engaging Questions & Answers for Success

Master Class 12 English: Engaging Questions & Answers for Success

Master Class 12 Economics: Engaging Questions & Answers for Success

Master Class 12 Social Science: Engaging Questions & Answers for Success

Master Class 12 Maths: Engaging Questions & Answers for Success

Master Class 12 Chemistry: Engaging Questions & Answers for Success

Trending doubts
Why is insulin not administered orally to a diabetic class 12 biology CBSE

The total number of isomers considering both the structural class 12 chemistry CBSE

What is the Full Form of PVC, PET, HDPE, LDPE, PP and PS ?

How do you convert from joules to electron volts class 12 physics CBSE

Define Vant Hoff factor How is it related to the degree class 12 chemistry CBSE

The first microscope was invented by A Leeuwenhoek class 12 biology CBSE
