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Two uniform spheres having opposite charges. The coulomb force of attraction between them is $F .$ When they are connected by a wire and then separated and placed at the same distance, then the coulomb force becomes repulsive and equals $\frac{F}{15} .$ Calculate the ratio of initial charges on the spheres.

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Important Questions on Electric Charges and Fields

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity NEET>Chapter 1 - Electric Charges and Fields>TOPICWISE QUESTIONS>Q 22

Two charges

q_{1}

and

q_{2}

are placed in vacuum at a distance

d

and the force acting between them is

F

. If a medium of dielectric constant

4

is introduced around them, the force now will be

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity NEET>Chapter 1 - Electric Charges and Fields>TOPICWISE QUESTIONS>Q 23

Two charges placed in air repel each other by a force of

10^{- 4} N

. When oil is introduced between the charges, the force becomes

2.5 \times 10^{- 5} N

. The dielectric constant of oil is

EASY

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity NEET>Chapter 1 - Electric Charges and Fields>TOPICWISE QUESTIONS>Q 24

An electron is moving around the nucleus of a hydrogen atom in a circular orbit of radius

r

. The Coulomb force

\vec{F}

between the two is (where,

k = \frac{1}{4 π ε_{0}}

and

\hat{r}

is radially outward).

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity NEET>Chapter 1 - Electric Charges and Fields>TOPICWISE QUESTIONS>Q 25

Two spherical conductors,

B

and

C

having equal radii and carrying equal charges repel each other with a force

F

when kept apart at some distance. A third spherical conductor having same radius as that of

B

but uncharged is brought in contact with

B

, then brought in contact with

C

and finally removed away from both. The new force of repulsion between

B

and

C

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity NEET>Chapter 1 - Electric Charges and Fields>TOPICWISE QUESTIONS>Q 26

Two small spheres each having charge

+ Q

are suspended by insulating threads of length

L

from a hook. If this arrangement is taken in space where there is no gravitational effect, then the angle between the two suspensions and the tension in each will, respectively, be

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity NEET>Chapter 1 - Electric Charges and Fields>TOPICWISE QUESTIONS>Q 27

An infinite number of charges, each of charge

1 μC,

are placed on the

x -

axis with coordinates

x = 1, 2, 4, 8, \dots . . \infty

where,

x

is in meters. If a charge of

1 C

is kept at the origin, then what is the net force acting on

1 C

charge?

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity NEET>Chapter 1 - Electric Charges and Fields>TOPICWISE QUESTIONS>Q 28

A total charge

Q

is broken into two parts

Q_{1}

and

Q_{2}

and they are placed at a distance

R

from each other. The maximum force of repulsion between them will occur when,

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Chapterwise/Topicwise Daily Practice Problems (DPP) Electrostatics and Current Electricity NEET>Chapter 1 - Electric Charges and Fields>TOPICWISE QUESTIONS>Q 29

A charged metallic bob of mass $m$ and charge $Q$ is in equilibrium in the presence of electric repulsion by a fixed charge $Q$ as shown in the figure. Find the value of $Q .$

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Two uniform spheres having opposite charges. The coulomb force of attraction between them is F. When they are connected by a wire and then separated and placed at the same distance, then the coulomb force becomes repulsive and equals F15. Calculate the ratio of initial charges on the spheres.

Important Questions on Electric Charges and Fields

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