MEDIUM

NEET

IMPORTANT

Earn 100

Three charges $+ Q, q, + Q$ are placed respectively, at distance, $0, d / 2$ and $d$ from the origin, on the $x$ -axis. If the net force experienced by $+ Q,$ placed at $x = 0,$ is zero, then value of $q$ is:

62.5% studentsanswered this correctly

Important Questions on Electrostatics

HARD

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-3>Q 41

For a uniformly charged ring of radius

R,

the electric field on its axis has the largest magnitude at a distance

h

from its centre. Then value of

h

MEDIUM

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-3>Q 42

Two point charges

q_{1} (\sqrt{10} μC)

and

q_{2} (- 25 μC)

are placed on the

x

-axis at

x = 1 m

and

x = 4 m

respectively. The electric field

(in V m^{- 1})

at a point

y = 3 m

y

-axis is,

[Take \frac{1}{4 π ϵ_{0}} = 9 \times 10^{9} N m^{2} C^{- 2}]

MEDIUM

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-3>Q 43

Charge is distributed within a sphere of radius

R

with a volume charge density

ρ (r) = \frac{A}{r^{2}} e^{- \frac{2 r}{a}},

where

A

and

a

are constants. If

Q

is the total charge of this charge distribution, the radius

R

is_____.

MEDIUM

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-3>Q 44

A charge

Q

is distributed over three concentric spherical shells of radii

a, b, c (a < b < c)

such that their surface charge densities are equal to one another.

The total potential at a point at distance

r

from their common centre, where

r < a,

would be:

MEDIUM

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-3>Q 45

Two electric dipoles, $A,$ $B$ with respective dipole moments $\vec{d_{A}} = - 4 q a \hat{i}$ and $\vec{d_{B}} = - 2 q a \hat{i}$ are placed on the $x$ -axis with separation $R,$ as shown in the figure
Question Image

The distance from $A$ at which both of them produce the same potential is:

HARD

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-3>Q 46

Four equal point charges

Q

each are placed in the

x y

plane at

(0, 2), (4, 2), (4, - 2)

and

(0, - 2)

. The work required to put a fifth charge

Q

at the origin of the coordinate system will be:

MEDIUM

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-3>Q 47

Charges $- q$ and $+ q$ located at $A$ and $B,$ respectively, constitute an electric dipole. Distance $A B =$ $2 a, O$ is the mid point of the dipole and $O P$ is perpendicular to $A B .$ A charge $Q$ is placed at $P$ where $O P = y$ and $y > > 2 a .$ The charge $Q$ experiences an electrostatic force $F .$ If $Q$ is now moved along the equatorial line to $P^{'}$ such that $O P^{'} = (\frac{y}{3}),$ the force on $Q$ will be close to: $(\frac{y}{3} > 2 a)$

Question Image

EASY

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 22 - Electrostatics>Exercise-3>Q 48

The given graph shown variation (with distance $r$ from centre) of:

Question Image

Three charges +Q, q,+Q are placed respectively, at distance, 0,d/2 and d from the origin, on the x -axis. If the net force experienced by +Q, placed at x=0, is zero, then value of q is:

Important Questions on Electrostatics

Learn and Prepare for any exam you want !

Three charges $+ Q, q, + Q$ are placed respectively, at distance, $0, d / 2$ and $d$ from the origin, on the $x$ -axis. If the net force experienced by $+ Q,$ placed at $x = 0,$ is zero, then value of $q$ is: