Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Two metallic spheres are charged to the same potential. One of them is hollow and another is solid, and both have the same radii. Solid sphere will have lower charge than the hollow one. Reason R : Capacitance of metallic spheres depend on the radii of spheres. In the light of the above statements, choose the correct answer from the options given below.

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is not the correct explanation of A

Let σ be the uniform surface charge density of two infinite thin plane sheets shown in figure. Then the electric fields in three different region E I , E I I and E I I I

E → I = - σ ∈ 0 n ^ , E → I I = 0 , E → I I I = σ ∈ 0 n ^

E → I = 2 σ ∈ 0 n ^ , E → I I = 0 , E → I I I = 2 σ ∈ 0 n ^

E → I = 0 , E → I I = σ ∈ 0 n ^ , E → I I I = 0

E → I = σ 2 ∈ 0 n ^ , E → I I = 0 , E → I I I = σ 2 ∈ 0 n ^

Considering a group of positive charges, which of the following statements is correct?

Net potential of the system cannot be zero at a point but net electric field can be zero at that point

Net potential of the system at a point can be zero but net electric field can't be zero at that point

Both the net potential and the net field can be zero at a point

Both the net potential and the net electric field cannot be zero at a point

HARD

JEE Main

IMPORTANT

Earn 100

A capacitor is discharging through a resistor $R$ . Consider in time $t_{1}$ , the energy stored in the capacitor reduces to half of its initial value and in time $t_{2}$ , the charge stored reduces to one eighth of its initial value. The ratio $\frac{t_{1}}{t_{2}}$ will be

5.88% studentsanswered this correctly

Important Questions on Electrostatics

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 29 June 2022 Shift 2>Q 194

If the electric potential at any point

(x, y, z) m

in space is given by

V = 3 x^{2}

volt. The electric field at the point

(1, 0, 3) m

will be :

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 25 July 2022 Shift 1>Q 195

A condenser of

2 μ F

capacitance is charged steadily from

0

5 C

. Which of the following graph represents correctly the variation of potential difference

(V)

across its plates with respect to the charge

(Q)

on the condenser?

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 25 July 2022 Shift 1>Q 196

The volume charge density of a sphere of radius $6 m$ is $2 μC {cm}^{- 3}$ . The number of lines of force per unit surface area coming out from the surface of the sphere is _____ $\times 10^{10} N C^{- 1} .$

[Given : Permittivity of vacuum $ϵ_{0} = 8.85 \times 10^{- 12} C^{2} N^{- 1} - m^{- 2}$ ]

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 25 July 2022 Shift 2>Q 197

Capacitance of an isolated conducting sphere of radius

R_{1}

becomes

n

times when it is enclosed by a concentric conducting sphere of radius

R_{2}

connected to earth. The ratio of their radii

(\frac{R_{2}}{R_{1}})

is:

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 25 July 2022 Shift 2>Q 198

Two parallel plate capacitors of capacity

C

and

3 C

are connected in parallel combination and charged to a potential difference

18 V

. The battery is then disconnected and the space between the plates of the capacitor of capacity

C

is completely filled with a material of dielectric constant

9

. The final potential difference across the combination of capacitors will be _____

V

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 26 July 2022 Shift 1>Q 199

The total charge on the system of capacitance

C_{1} = 1 μF, C_{2} = 2 μF, C_{3} = 4 μF

and

C_{4} = 3 μF

connected in parallel is
(Assume a battery of

20 V

is connected to the combination)

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 26 July 2022 Shift 1>Q 200

A composite parallel plate capacitor is made up of two different dielectric materials with different thickness ( $t_{1}$ and $t_{2}$ ) as shown in figure. The two different dielectric material are separated by a conducting foil $F$ . The voltage of the conducting foil is _____ $V$ .

Question Image

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 26 July 2022 Shift 2>Q 201

Two uniformly charged spherical conductors

A

and

B

of radii

5 mm

and

10 mm

are separated by a distance of

2 cm

. If the spheres are connected by a conducting wire, then in equilibrium condition, the ratio of the magnitudes of the electric fields at the surface of the sphere

A

and

B

will be

A capacitor is discharging through a resistor R. Consider in time t1, the energy stored in the capacitor reduces to half of its initial value and in time t2, the charge stored reduces to one eighth of its initial value. The ratio t1t2 will be

Important Questions on Electrostatics

Learn and Prepare for any exam you want !

A capacitor is discharging through a resistor $R$ . Consider in time $t_{1}$ , the energy stored in the capacitor reduces to half of its initial value and in time $t_{2}$ , the charge stored reduces to one eighth of its initial value. The ratio $\frac{t_{1}}{t_{2}}$ will be