Q. I. In all respects, the displacement current has the same physical effects as the conduction current.
II. Due to electric fields in a conducting wire, the displacement current may be zero, since the electric field does not change with time.
III. The charging capacitor, both conduction and displacement currents may be present in same regions of space.
IV. In most of the cases, they both may be present in the same region of space, as there exist no perfectly conducting or perfectly insulating medium.

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Solution:

Correct answer is (d) I, II and IV