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

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JEE Main

IMPORTANT

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A $5 μF$ capacitor is charged fully by a $220 V$ supply. It is then disconnected from the supply and is connected in series to another uncharged $2.5 μF$ capacitor. If the energy change during the charge redistribution is $\frac{X}{100} J$ then value of $X$ to the nearest integer is :

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Important Questions on Electrostatics

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 2 September 2020 Shift 2>Q 57

10 μF

capacitor is fully charged to a potential difference of

50 V

After removing the source voltage it is connected to an uncharged capacitor in parallel. Now the potential difference across them becomes

20 V

. The capacitance of the second capacitor is :

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 2 September 2020 Shift 2>Q 58

A small point mass carrying some positive charge on it, is released from the edge of a table. There is a uniform electric field in this region in the horizontal direction. Which of the following options then correctly describe the trajectory of the mass ? (Curves are drawn schematically and are not to scale)

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 2 September 2020 Shift 2>Q 59

A charge Q is distributed over two concentric conducting thin spherical shells radii $r$ and $R (R > r)$ . If the surface charge densities on the two shells are equal, the electric potential at the common centre is :

Question Image

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 3 September 2020 Shift 1>Q 60

Two isolated conducting spheres

S_{1}

and

S_{2}

of radius

\frac{2}{3} R

and

\frac{1}{3} R

have

12 μ C

and

- 3 μ C

charges, respectively, and are at a large distance from each other, They are now connected by a conducting wire. A long time after this is done the charges on

S_{1}

and

S_{2}

are respectively:

MEDIUM

JEE Main

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 3 September 2020 Shift 1>Q 61

In the circuit shown in the figure, the total charge is $750 μ C$ and the voltage across capacitor $C_{2}$ is $20 V$ . Then the charge on capacitor $C_{2}$ is :

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 3 September 2020 Shift 2>Q 62

Concentric metallic hollow spheres of radii

R

and

4 R

hold charges

Q_{1}

and

Q_{2}

respectively. Given that surface charge density of the concentric spheres are equal, the potential difference

V (R) - V (4 R)

is:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 4 September 2020 Shift 1>Q 63

Two charged thin infinite plane sheets of uniform charge density

σ_{+}

and

σ_{-}

, where

|σ_{+}| > |σ_{-}|

, intersect at the right angle. Which of the following best represents the electric field lines for the system:

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Electrostatics>JEE Main - 4 September 2020 Shift 1>Q 64

A two point charges $4 q$ and $- q$ are fixed on the $x$ -axis at $x = \frac{- d}{2}$ and $x = \frac{d}{2}$ , respectively. If the third point charge ‘ $q$ ’ is taken from the origin to $x = d$ along the semicircle as shown in the figure, the energy of the charge will:

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A 5 μF capacitor is charged fully by a 220 V supply. It is then disconnected from the supply and is connected in series to another uncharged 2.5 μF capacitor. If the energy change during the charge redistribution is X100 J then value of X to the nearest integer is :

Important Questions on Electrostatics

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A $5 μF$ capacitor is charged fully by a $220 V$ supply. It is then disconnected from the supply and is connected in series to another uncharged $2.5 μF$ capacitor. If the energy change during the charge redistribution is $\frac{X}{100} J$ then value of $X$ to the nearest integer is :