Physics · 2025
JEE Main · 24 January 2025, Shift 1 · Q37
A parallel plate capacitor was made with two rectangular plates, each with a length of l=3 cm and breath of b =1 cm. The distance between the plates…
A parallel plate capacitor was made with two rectangular plates, each with a length of $\displaystyle l=3 \mathrm{~cm}$ and breath of $\displaystyle \mathrm{b}=1 \mathrm{~cm}$. The distance between the plates is $\displaystyle 3 \mu \mathrm{~m}$. Out of the following, which are the ways to increase the capacitance by a factor of $\displaystyle 10$ ?
A. $\displaystyle l=30 \mathrm{~cm}, \mathrm{~b}=1 \mathrm{~cm}, \mathrm{~d}=1 \mu \mathrm{~m}$
B. $\displaystyle l=3 \mathrm{~cm}, \mathrm{~b}=1 \mathrm{~cm}, \mathrm{~d}=30 \mu \mathrm{~m}$
C. $\displaystyle l=6 \mathrm{~cm}, \mathrm{~b}=5 \mathrm{~cm}, \mathrm{~d}=3 \mu \mathrm{~m}$
D. $\displaystyle l=1 \mathrm{~cm}, \mathrm{~b}=1 \mathrm{~cm}, \mathrm{~d}=10 \mu \mathrm{~m}$
E. $\displaystyle l=5 \mathrm{~cm}, \mathrm{~b}=2 \mathrm{~cm}, \mathrm{~d}=1 \mu \mathrm{~m}$
Choose the correct answer from the options given below:
Official answer
From NTA’s final answer key for this paper.
(3)
C and E only
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JEE Main 2025 Physics question, with the answer from NTA’s final answer key. Where our answers come from.