A) \[AC\] current
B) \[DC\] current
C) displacement current
D) impedance
Correct Answer: C
Solution :
Maxwell transformed Ampere's law as curl\[\overset{\to }{\mathop{\mathbf{B}}}\,={{\mu }_{0}}\left( \overset{\to }{\mathop{\mathbf{J}}}\,+\frac{\delta \overset{\to }{\mathop{\mathbf{D}}}\,}{\delta t} \right)\] The term \[\frac{\delta \overset{\to }{\mathop{\mathbf{D}}}\,}{\delta t}\] is called displacement current density, since it arises when the electric displacement \[\overset{\to }{\mathop{\mathbf{D}}}\,\] changes with time. Maxwell assumed that it is just as effective as \[\overset{\to }{\mathop{\mathbf{J}}}\,\] in producing magnetic field. The introduction of displacement current is one Maxwell major contribution to the electromagnetic theory.
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