1
JEE Main 2025 (Online) 2nd April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Consider a circular loop that is uniformly charged and has a radius $\mathrm{a} \sqrt{2}$. Find the position along the positive $z$-axis of the cartesian coordinate system where the electric field is maximum if the ring was assumed to be placed in $x y$ plane at the origin :
A
a
B
$a / 2$
C
0
D

$$ a / \sqrt{2} $$

2
JEE Main 2025 (Online) 2nd April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Consider two infinitely large plane parallel conducting plates as shown below. The plates are uniformly charged with a surface charge density $+\sigma$ and $-2 \sigma$. The force experienced by a point charge +q placed at the mid point between two plates will be:

JEE Main 2025 (Online) 2nd April Morning Shift Physics - Electrostatics Question 14 English

A
$\frac{3 \sigma q}{4 \epsilon_0}$
B
$\frac{3 \sigma \mathrm{q}}{2 \epsilon_0}$
C
$\frac{\sigma \mathrm{q}}{4 \epsilon_0}$
D
$\frac{\sigma q}{2 \epsilon_0}$
3
JEE Main 2025 (Online) 2nd April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A point charge $+q$ is placed at the origin. A second point charge $+9 q$ is placed at ($\mathrm{d}, 0,0$) in Cartesian coordinate system. The point in between them where the electric field vanishes is:

A
$(3 \mathrm{d} / 4,0,0)$
B
$(\mathrm{d} / 4,0,0)$
C
$(4 \mathrm{d} / 3,0,0)$
D
$(\mathrm{d} / 3,0,0)$
4
JEE Main 2025 (Online) 2nd April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A small bob of mass 100 mg and charge $+10 \mu \mathrm{C}$ is connected to an insulating string of length 1 m . It is brought near to an infinitely long non-conducting sheet of charge density ' $\sigma$ ' as shown in figure. If string subtends an angle of $45^{\circ}$ with the sheet at equilibrium the charge density of sheet will be.

(Given, $\epsilon_0=8.85 \times 10^{-12} \frac{\mathrm{~F}}{\mathrm{~m}}$ and acceleration due to gravity, $\mathrm{g}=10 \frac{\mathrm{~m}}{\mathrm{~s}^2}$ )

JEE Main 2025 (Online) 2nd April Morning Shift Physics - Electrostatics Question 13 English

A
$1.77 \mathrm{~nC} / \mathrm{m}^2$
B
$0.885 \mathrm{~nC} / \mathrm{m}^2$
C
$885 \mathrm{~nC} / \mathrm{m}^2$
D
$17.7 \mathrm{~nC} / \mathrm{m}^2$
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