New chat PYQ Library Doubts Rank report

Sign in to see Recents

Sign in to save progress →

Electrostatics question

2025 · 28 Jan · Shift 1 · Q65

Guest · try one question or challengeGuest · try one question or challenge

PYQ Library
JEE Main
Physics
Electrostatics
2025 · 28 Jan · Shift 1 · Q65

Electrostatics question

2025 · 28 Jan · Shift 1 · Q65

JEE MainPhysicsElectrostaticsMCQ+4 / −1

A particle of mass '

m

' and charge '

q

' is fastened to one end '

A

' of a massless string having equilibrium length

l

, whose other end is fixed at point '

O

'. The whole system is placed on a frictionless horizontal plane and is initially at rest. If uniform electric field is switched on along the direction as shown in figure, then the speed of the particle when it crosses the

x

-axis is

JEE Main 2025 (Online) 28th January Morning Shift Physics - Electrostatics Question 20 English

A
$\sqrt{\frac{\mathrm{qE} l}{2 \mathrm{~m}}}$
B
$\sqrt{\frac{\mathrm{qE} l}{4 \mathrm{~m}}}$
C
$\sqrt{\frac{\mathrm{qE} l}{\mathrm{~m}}}$
D
$\sqrt{\frac{2 \mathrm{qE} l}{\mathrm{~m}}}$

More from Electrostatics

An electric dipole of dipole moment $6 \times 1 0^{- 6} Cm$ is placed in uniform electric field of magnitude $1 0^{6} V / m$ . Initially, the dipole moment is parallel to electric field. The work that needs to be…2025 · Numerical
An electric dipole of mass $m$ , charge $q$ , and length $l$ is placed in a uniform electric field $E = E_{0} \hat{i}$ . When the dipole is rotated slightly from its equilibrium position and released, the time period of its oscillations…2025 · MCQ
Match List - I with List - II. Choose the correct answer from the options given below : Includes table2025 · MCQ
A point charge causes an electric flux of $- 2 \times 1 0^{4} Nm^{2} C^{- 1}$ to pass through a spherical Gaussian surface of 8.0 cm radius, centred on the charge. The value of the point charge is : (Given $ϵ_{0} = 8.85 \times 1 0^{- 12} C^{2} N^{- 1} m^{- 2}$ …2025 · MCQ
An electric dipole is placed at a distance of 2 cm from an infinite plane sheet having positive charge density $σ_{o}$ . Choose the correct option from the following. Includes diagram2025 · MCQ
Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle $θ$ with each other. When suspended in water the angle remains the same. If density of the material of the sphere is $1.5 g / cc$ …2024 · Numerical
$C_{1}$ and $C_{2}$ are two hollow concentric cubes enclosing charges $2 Q$ and $3 Q$ respectively as shown in figure. The ratio of electric flux passing through $C_{1}$ and $C_{2}$ is : Includes diagram2024 · MCQ
Suppose a uniformly charged wall provides a uniform electric field of $2 \times 1 0^{4} N / C$ normally. A charged particle of mass $2 g$ being suspended through a silk thread of length $20 cm$ and…2024 · Numerical