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ElectricalElectromagnetics Field Theory
PrevNext

MaxwellтАЩs second equation is based on

A

Ampere's law

B

Faraday's law

C

Lenz law

D

Coulomb's law

Correct Answer

тЪЩя╕П TE тАв Technical Concept & PrincipleElectricalElectromagnetics Field Theory
Option A

Ampere's law

Quick Summary:

Maxwell's second equation (in differential form) is expressed as тИЗ├ЧH=J+тИВDтИВt\nabla \times \mathbf{H} = \mathbf{J} + \frac{\partial \mathbf{D}}{\partial t}тИЗ├ЧH=J+тИВtтИВDтАЛ. This equation is a generalized version of Ampere's Circuital Law, incorporating Maxwell's displacement current density term to account for time-varying electric fields.

тЪЩя╕ПTETechnical SolutionConcept & Principle
ЁЯТб Explanation

Maxwell's second equation (in differential form) is expressed as тИЗ├ЧH=J+тИВDтИВt\nabla \times \mathbf{H} = \mathbf{J} + \frac{\partial \mathbf{D}}{\partial t}тИЗ├ЧH=J+тИВtтИВDтАЛ. This equation is a generalized version of Ampere's Circuital Law, incorporating Maxwell's displacement current density term to account for time-varying electric fields.

ЁЯФв Key Formulas

тИЗ├ЧH=J+тИВDтИВt\nabla \times \mathbf{H} = \mathbf{J} + \frac{\partial \mathbf{D}}{\partial t}тИЗ├ЧH=J+тИВtтИВDтАЛ тАФ Differential form of Maxwell-Ampere Law

тИоCHтЛЕdl=Ienclosed+тИлSтИВDтИВtтЛЕdS\oint_C \mathbf{H} \cdot d\mathbf{l} = I_{enclosed} + \int_S \frac{\partial \mathbf{D}}{\partial t} \cdot d\mathbf{S}тИоCтАЛHтЛЕdl=IenclosedтАЛ+тИлSтАЛтИВtтИВDтАЛтЛЕdS тАФ Integral form

тЪЩя╕П Working Principle

The principle states that a magnetic field can be generated by two sources: a conduction current density J\mathbf{J}J and a time-varying electric field flux density тИВDтИВt\frac{\partial \mathbf{D}}{\partial t}тИВtтИВDтАЛ. By adding the displacement current term, Maxwell ensured the consistency of the equation with the equation of continuity, allowing for the propagation of electromagnetic waves.

ЁЯУМ Key Points
  • тЦ╕

    Maxwell's second equation explains how magnetic fields are created by electric currents and time-varying electric fields.

  • тЦ╕

    The term тИВDтИВt\frac{\partial \mathbf{D}}{\partial t}тИВtтИВDтАЛ is known as displacement current density.

  • тЦ╕

    This equation demonstrates that a magnetic field exists even in the absence of a conduction current if the electric field changes over time.

тЬЕ Advantages
  • тЦ╕

    Ensures consistency with the principle of charge conservation.

  • тЦ╕

    Predicts the existence of electromagnetic waves in free space.

тЭМ Disadvantages / Limitations
  • тЦ╕

    Does not account for magnetic monopoles (which are explicitly forbidden by Gauss's Law for magnetism).

  • тЦ╕

    Mathematical complexity increases with dynamic fields.

ЁЯЫая╕П Applications / Uses
  • тЦ╕

    Design of antennas and wave propagation systems.

  • тЦ╕

    Analysis of capacitors under high-frequency AC signals.

ЁЯУД Additional Information
  • тЦ╕

    Maxwell's equations are often listed in different orders depending on the textbook; however, the equation involving the curl of H is universally known as the Maxwell-Ampere law.

  • тЦ╕

    Option B (Faraday's Law) corresponds to Maxwell's third equation (тИЗ├ЧE=тИТтИВBтИВt\nabla \times \mathbf{E} = -\frac{\partial \mathbf{B}}{\partial t}тИЗ├ЧE=тИТтИВtтИВBтАЛ).

ЁЯУК Diagram / Illustration
Maxwell's Second EquationтИЗ ├Ч H = J +(тИВ D / тИВ t)Generalized Ampere's Law
тЬЕ

A is correct тАФ Maxwell's second equation represents the Ampere-Maxwell law, which relates the curl of the magnetic field intensity to the conduction and displacement current densities.

Core Concepts Used
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Ampere's Law Displacement Current Electromagnetic Field Theory
ЁЯТб EXAM TIP

Remember the sequence: Gauss(E), Gauss(B), Faraday(E), Ampere-Maxwell(H). A common mnemonic is 'Electro-Magneto-Induction-Ampere'.

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