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

In the given figure, a battery of emf $E$ is connected across a conductor $P Q$ of length $l$ and different area of cross-sections having radii $r_{1}$ and $r_{2} (r_{2} < r_{1}) .$

Choose the correct option as one moves from $P$ to $Q$ .

15.38% studentsanswered this correctly

Important Questions on Electrostatics

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 27 July 2021 Shift 1>Q 23

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A capacitor of capacitance $C = 1 μ F$ is suddenly connected to a battery of $100 V$ through a resistance $R = 100 Ω .$ The time taken for the capacitor to be charged to get $50 V$ is:

(Take $\ln 2 = 0.69$ )

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 27 July 2021 Shift 1>Q 24

In the reported figure, a capacitor is formed by placing a compound dielectric between the plates of parallel plate capacitor. The expression for the capacity of the said capacitor will be: (Given the area of the plate $= A$ )

Question Image

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 27 July 2021 Shift 1>Q 25

Two capacitors of capacities

2 C

and

C

are joined in parallel and charged up to potential

V .

The battery is removed and the capacitor of capacity

C

is filled completely with a medium of dielectric constant

K .

The potential difference across the capacitors will now be:

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 27 July 2021 Shift 1>Q 26

Two identical tennis balls each having mass

m

and charge

q

are suspended from a fixed point by threads of length

l .

What is the equilibrium separation when each thread makes a small angle

θ

with the vertical?

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 27 July 2021 Shift 2>Q 27

A simple pendulum of mass ' $m$ ', length ' $l$ ' and charge $' + q^{'}$ suspended in the electric field produced by two conducting parallel plates as shown. The value of deflection of pendulum in equilibrium position will be

Question Image

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 27 July 2021 Shift 2>Q 28

What will be the magnitude of the electric field at point $O$ as shown in the figure? Each side of the figure is $l$ and perpendicular to the other?

Question Image

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main 16 March 2021 Shift 1>Q 29

For changing the capacitance of a given parallel plate capacitor, a dielectric material of dielectric constant

K

is used, which has the same area as the plates of the capacitor. The thickness of the dielectric slab is

\frac{3}{4} d

, where

d

is the separation between the plates of parallel plate capacitor. The new capacitance

C^{'}

in terms of original capacitance

C_{0}

is given by the following relation :

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main 16 March 2021 Shift 1>Q 30

An $R C$ circuit as shown in the figure is driven by a $A C$ source generating a square wave. The output wave pattern monitored by $C R O$ would look close to :

Question Image

In the given figure, a battery of emf E is connected across a conductor PQ of length l and different area of cross-sections having radii r1 and r2r2<r1. Choose the correct option as one moves from P to Q.

Important Questions on Electrostatics

Learn and Prepare for any exam you want !

In the given figure, a battery of emf $E$ is connected across a conductor $P Q$ of length $l$ and different area of cross-sections having radii $r_{1}$ and $r_{2} (r_{2} < r_{1}) .$

Choose the correct option as one moves from $P$ to $Q$ .