CBSE 2026 · Region 5 · Set 1 · Q25 · 3 marks
What is displacement current $\displaystyle \left(\mathrm{i}_{\mathrm{d}}\right)$? Considering the case of charging of a capacitor, show that $\displaystyle \mathrm{i}_{\mathrm{d}}=\varepsilon_{0} \frac{\mathrm{~d} \phi_{\mathrm{E}}}{\mathrm{dt}}$. What is the value of $\displaystyle \mathrm{i}_{\mathrm{d}}$ for a conductor across which a constant voltage is applied?
Marking-scheme solution
Defining displacement current.
Showing $\displaystyle \mathrm{i}_{\mathrm{d}}=\varepsilon_{0} \frac{\mathrm{d} \phi_{e}}{\mathrm{d} t}$
Writing value of $\displaystyle \mathrm{i}_{\mathrm{d}}$ when constant voltage is applied.
Electromagnetic WavesDisplacement CurrentApplyshort_answermedium
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CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.