JEE Main 2026 — Capacitance Question with Solution
JEE Main 2026 (21 January Shift 1)
Question
A parallel plate capacitor has capacitance , when there is vacuum within the parallel plates. A sheet having thickness of the separation between the plates and relative permittivity is introduced between the plates. The new capacitance of the system is :
Choose an option
Show full solutionCorrect option: C
Correct answer
C
Step-by-step explanation
Original capacitance:
After inserting dielectric of thickness , system becomes two capacitors in series.
Vacuum region:
Dielectric region:
Equivalent capacitance:
After inserting dielectric of thickness , system becomes two capacitors in series.
Vacuum region:
Dielectric region:
Equivalent capacitance:
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Capacitance chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.
Solve interactively →About this question
This is a previous-year question from JEE Main 2026, covering the Capacitance chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.