Quiz for Displacement current

Q1: What is displacement current?

A. Current in a dielectric due to a changing electric field B. Current in a conductor due to a changing magnetic field C. Current due to motion of charges D. Current in superconductors

Q2: Who introduced the concept of displacement current?

A. Newton B. Faraday C. Maxwell D. Ampere

Q3: Displacement current is present in which region of a capacitor?

A. Plates B. Dielectric C. Wires D. Battery

Q4: Displacement current density is given by:

A. ε₀ dB/dt B. σE C. ε₀ dE/dt D. J = σE

Q5: What ensures continuity of current in a capacitor circuit?

A. Conduction current B. Battery voltage C. Displacement current D. Resistance

Q6: Unit of displacement current is:

A. Coulomb B. Ampere C. Farad D. Volt

Q7: Maxwell modified which law to include displacement current?

A. Ampere’s Law B. Gauss’s Law C. Faraday’s Law D. Ohm’s Law

Q8: Displacement current leads to the generation of:

A. Magnetic field only B. Electric field only C. Both electric and magnetic fields D. Only current

Q9: Displacement current is analogous to:

A. Conduction current B. Induced emf C. Magnetization D. Polarization

Q10: In vacuum, displacement current density is:

A. ε₀ dE/dt B. σE C. 0 D. ε₀E

Q11: Why was displacement current introduced?

A. To satisfy Ohm’s law B. To complete Faraday’s law C. To explain electric flux D. To preserve continuity of current

Q12: Total current in Maxwell’s equation is:

A. Only conduction current B. Sum of conduction and displacement current C. Only displacement current D. None of these

Q13: What is ε₀ in displacement current formula?

A. Magnetic constant B. Permittivity of free space C. Permeability of free space D. Charge density

Q14: Which field is changing in displacement current?

A. Electric field B. Magnetic field C. Both fields D. No field changes

Q15: The source of magnetic field in Maxwell’s correction is:

A. Conduction current only B. Displacement current only C. Both conduction and displacement current D. None of these

Q16: In which medium can displacement current exist?

A. Only in conductors B. Only in vacuum C. Only in dielectrics D. In both vacuum and dielectrics

Q17: Displacement current is proportional to:

A. Rate of change of magnetic field B. Rate of change of electric field C. Electric field D. Magnetic field

Q18: What bridges the gap in a capacitor for current continuity?

A. Voltage drop B. Displacement current C. Conduction current D. Resistance

Q19: The presence of displacement current explains:

A. Electrostatics B. Steady current C. Capacitor charging circuit D. Wave propagation in space

Q20: In Maxwell’s equation, ∇ × B = μ₀(J + ?)

A. σE B. ε₀ dE/dt C. E D. 0