1
JEE Main 2025 (Online) 24th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Consider a parallel plate capacitor of area A (of each plate) and separation ' $d$ ' between the plates. If $E$ is the electric field and $\varepsilon_0$ is the permittivity of free space between the plates, then potential energy stored in the capacitor is

A
$\varepsilon_0 \mathrm{E}^2 \mathrm{Ad}$
B
$\frac{3}{4} \varepsilon_0 \mathrm{E}^2 \mathrm{Ad}$
C
$\frac{1}{4} \varepsilon_0 \mathrm{E}^2 \mathrm{Ad}$
D
$\frac{1}{2} \varepsilon_0 \mathrm{E}^2 \mathrm{Ad}$
2
JEE Main 2025 (Online) 23rd January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Two point charges $-4 \mu \mathrm{c}$ and $4 \mu \mathrm{c}$, constituting an electric dipole, are placed at $(-9,0,0) \mathrm{cm}$ and $(9,0,0) \mathrm{cm}$ in a uniform electric field of strength $10^4 \mathrm{NC}^{-1}$. The work done on the dipole in rotating it from the equilibrium through $180^{\circ}$ is :

A
18.4 mJ
B
12.4 mJ
C
16.4 mJ
D
14.4 mJ
3
JEE Main 2025 (Online) 23rd January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Two charges $7 \mu \mathrm{c}$ and $-4 \mu \mathrm{c}$ are placed at $(-7 \mathrm{~cm}, 0,0)$ and $(7 \mathrm{~cm}, 0,0)$ respectively. Given, $\epsilon_0=8.85 \times 10^{-12} \mathrm{C}^2 \mathrm{~N}^{-1} \mathrm{~m}^{-2}$, the electrostatic potential energy of the charge configuration is :

A
$-2.0$ J
B
$-1.5$ J
C
$-1.2$ J
D
$-1.8$ J
4
JEE Main 2025 (Online) 23rd January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A point particle of charge $Q$ is located at $P$ along the axis of an electric dipole 1 at a distance $r$ as shown in the figure. The point P is also on the equatorial plane of a second electric dipole 2 at a distance r. The dipoles are made of opposite charge q separated by a distance $2 a$. For the charge particle at P not to experience any net force, which of the following correctly describes the situation?

JEE Main 2025 (Online) 23rd January Morning Shift Physics - Electrostatics Question 28 English

A
$\frac{a}{r} \sim 0.5$
B
$\frac{a}{r} \sim 3$
C
$\frac{a}{r} \sim 10$
D
$\frac{a}{r} \sim 20$
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