Question: Q. 12. A capacitor has been charged by a $d c$ source. What are the magnitudes of conduction and displacement currents, when it is fully charged?
U] [Delhi I, II, III 2013]
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Solution:
Ans. The magnitudes of conduction and displacement currents are zero. [CBSE Marking Scheme 2013] 1
Detailed Answer :
When a capacitor is charged initially, charges flow and it results an increase in potential of capacitor which lead to existence of conduction current. So during charging, voltage changes, which changes the electric field and electric flux in the dielectric of capacitor. Hence electric flux current density that is displacement current is obtained till the capacitor is not fully charged. Once the capacitor is fully charged, potential across the plates of capacitor becomes equal to the potential of $d c$ source which makes the conduction and displacement currents zero.
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