JEE Main 2025 — Capacitance Question with Solution
JEE Main 2025 (4 Apr Shift 2)
Question
Three parallel plate capacitors and each of capacitance are connected as shown in figure. The effective capacitance between points A and B, when the space between the parallel plates of capacitor is filled with a dielectric medium having dielectric constant of 4, is :
Choose an option
Show full solutionCorrect option: C
Correct answer
C
Step-by-step explanation
After dielectric
$\begin{aligned}
& \mathrm{C}_1=4 \mathrm{C} \\ & \mathrm{C}_1=4 \times 5=20 \mu \mathrm{~F} \\ & \mathrm{C}_2=\mathrm{C}_3=5 \mu \mathrm{~F}
\end{aligned}\mathrm{C}_1 \& \mathrm{C}_2\mathrm{C}_3\begin{aligned}
& C_{c q}=\frac{C_1 C_2}{C_1+C_2}+C_3 \Rightarrow \frac{20 \times 5}{20+5}+5 \\ & =4+5=9 \mu \mathrm{~F}
\end{aligned}$
Correct Option (3)
$\begin{aligned}
& \mathrm{C}_1=4 \mathrm{C} \\ & \mathrm{C}_1=4 \times 5=20 \mu \mathrm{~F} \\ & \mathrm{C}_2=\mathrm{C}_3=5 \mu \mathrm{~F}
\end{aligned}\mathrm{C}_1 \& \mathrm{C}_2\mathrm{C}_3\begin{aligned}
& C_{c q}=\frac{C_1 C_2}{C_1+C_2}+C_3 \Rightarrow \frac{20 \times 5}{20+5}+5 \\ & =4+5=9 \mu \mathrm{~F}
\end{aligned}$
Correct Option (3)
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This is a previous-year question from JEE Main 2025, 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.