NEET-UG and JEE Main Physics · Class 12
Displacement current — NEET & JEE Questions
Displacement current is a topic in Electromagnetic Waves, a Class 12 Physics chapter of the NEET-UG and JEE Main syllabus. TestBudy holds 14 published NEET-UG and JEE Main questions on Displacement current, each with the marking scheme of the real paper.
- questions
- 14
- shown here
- 10
Five free tests with an account. Your score comes with the result; where you stand is Pro.
Displacement current MCQs with solutions
10 of the 14 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.
Maxwell introduced displacement current to account for
- A. a changing electric field producing magnetic effects
- B. steady charges producing no fields
- C. only conduction electrons in metals
- D. magnetic monopoles
Between the plates of a charging capacitor, conduction current through the dielectric gap is ideally
- A. equal to infinite current
- B. zero
- C. larger than wire current
- D. always negative
The displacement current is proportional to the rate of change of
- A. magnetic charge
- B. mechanical momentum
- C. electric flux
- D. resistance
For a charging capacitor in a simple series circuit, the displacement current between the plates is
- A. always zero
- B. twice the conduction current
- C. unrelated to circuit current
- D. equal in magnitude to the conduction current in the wires
Maxwell introduced displacement current mainly to account for
- A. the magnetic effect associated with a changing electric field
- B. steady electrostatic fields only
- C. gravitational fields
- D. thermal conduction
If the electric field between capacitor plates changes twice as fast while geometry is fixed, displacement current becomes
- A. twice as large
- B. half as large
- C. four times as large
- D. unchanged
A fully charged ideal capacitor is connected to steady DC and has constant electric field. Its displacement current is
- A. maximum
- B. zero
- C. equal to V/R indefinitely
- D. independent of field change
For a parallel-plate capacitor being charged by a current I in the wires, the displacement current between the plates is
- A. equal to I
- B. zero
- C. twice I
- D. independent of the charging current
If the electric flux through a surface changes more rapidly with time, the associated displacement current
- A. increases
- B. decreases
- C. must remain zero
- D. changes only if charges cross the surface
Why was displacement current essential to Maxwell's extension of Ampere's law?
- A. It removes electric fields from capacitors
- B. It proves magnetic monopoles exist
- C. It makes the magnetic-field law consistent through surfaces crossing a charging capacitor gap
- D. It replaces conduction current in all wires
Common mistakes in Displacement current
Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.
- Applies the original steady-current form of Ampere's law without Maxwell's correction.
Practise this chapter
Reading a question and answering it under a clock are different things. A chapter-length test measures whether the topic went in.