16) Answer the following Qustions. [Each carries 1 mark]

X

2 This is demo ans.

Explain electric potential energy. Show that the sum of kinetic energy and electric potential

energy remains constant.

Write SI unit of electrostatic potential energy (Electric potential energy difference and its

dimensional formula).

Define electric potential and explain it. Write its SI unit and give its other units.

Derive an expression for the electric potential in a electric field of positive point charge at

distance r.

Derive the formula for the electric potential due to an electric dipole at a point from it.

Write an expression for potential at the point outside a uniformly charged spherical shell

outside on the surface and inside the shell.

What is an equipotential surface ? Draw an equipotential surfaces for a (1) single point

charge (2) charge + q and – q at few distance (dipole) (3) two + q charges at few distance

(4) uniform electric field.

Write the characteristics of equipotential surface.

Obtain the relation between electric field and electric potential.

Derive the formula for the electric potential energy of system of two charges.

Derive the formula for the electric potential energy of system of three charges.

Obtain the equation of electric potential energy of a system of two electric charges in external

electric field.

Derive equation of potential energy of an electric dipole in a uniform electric field.

Explain electrostatic shielding with necessary diagram.

Explain polarization of nonpolar molecule in uniform electric field and define the linear

isotropic dielectrics.

Explain polarisation of polar molecule in uniform electric field.

What is capacitor ? And explain capacitance. Give its SI unit.

What is parallel plate capacitor ? Obtain the formula for the capacitance of such a parallel

plate capacitor and on which factors does the value of capacitance depend ?

Write the difference between capacitors in series and parallel connections.

How does a capacitor store energy ? And obtain the formula for the energy stored in the

capacitor ?

Obtain the expression for the energy stored per unit volume in a charged capacitor.

Shrihari Higher Secondary SchoolMarks:21 Subject:12th-Phy

Chapter:2 Chap 2 Theory

Date:31/07/19

Time:

[A] [21]

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KU

MA

R PRA

KA

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END

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Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

Answer KeyMarks:21 Subject:12th-Phy

Chapter:2 Chap 2 Theory

Date:31/07/19

Time:

Section [ A ] : 1 Marks Questions

No Ans Chap Sec Que PageNo BookType

1 - Chap 2 A 3 Kumar

2 - Chap 2 A 5 Kumar

3 - Chap 2 A 6 Kumar

4 - Chap 2 A 7 Kumar

5 - Chap 2 A 11 Kumar

6 - Chap 2 A 15 Kumar

7 - Chap 2 A 17 Kumar

8 - Chap 2 A 19 Kumar

9 - Chap 2 A 20 Kumar

10 - Chap 2 A 21 Kumar

11 - Chap 2 A 22 Kumar

12 - Chap 2 A 25 Kumar

13 - Chap 2 A 26 Kumar

14 - Chap 2 A 36 Kumar

15 - Chap 2 A 39 Kumar

16 - Chap 2 A 40 Kumar

17 - Chap 2 A 42 Kumar

18 - Chap 2 A 44 Kumar

19 - Chap 2 A 53 Kumar

20 - Chap 2 A 54 Kumar

21 - Chap 2 A 55 Kumar

16) Answer the following Qustions. [Each carries 1 mark]

X

2 This is demo ans.

Explain electric potential energy. Show that the sum of kinetic energy and electric potential

energy remains constant.

Write SI unit of electrostatic potential energy (Electric potential energy difference and its

dimensional formula).

Define electric potential and explain it. Write its SI unit and give its other units.

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

Paper SolutionMarks:21 Subject:12th-Phy

Chapter:2 Chap 2 Theory

Date:31/07/19

Time:

[A] [21]

1.

2.

3.

Derive an expression for the electric potential in a electric field of positive point charge at

distance r.

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

// Page:2 //

4.

Derive the formula for the electric potential due to an electric dipole at a point from it.

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

// Page:3 //

5.

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

// Page:4 //

Write an expression for potential at the point outside a uniformly charged spherical shell

outside on the surface and inside the shell.

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

// Page:5 //

6.

What is an equipotential surface ? Draw an equipotential surfaces for a (1) single point

charge (2) charge + q and – q at few distance (dipole) (3) two + q charges at few distance

(4) uniform electric field.

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

// Page:6 //

7.

Write the characteristics of equipotential surface.

Obtain the relation between electric field and electric potential.

Derive the formula for the electric potential energy of system of two charges.

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

// Page:7 //

8.

9.

10.

Derive the formula for the electric potential energy of system of three charges.

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

// Page:8 //

11.

Obtain the equation of electric potential energy of a system of two electric charges in external

electric field.

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

// Page:9 //

12.

Derive equation of potential energy of an electric dipole in a uniform electric field.

Explain electrostatic shielding with necessary diagram.

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

// Page:10 //

13.

14.

Explain polarization of nonpolar molecule in uniform electric field and define the linear

isotropic dielectrics.

Explain polarisation of polar molecule in uniform electric field.

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

// Page:11 //

15.

16.

What is capacitor ? And explain capacitance. Give its SI unit.

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

// Page:12 //

17.

What is parallel plate capacitor ? Obtain the formula for the capacitance of such a parallel

plate capacitor and on which factors does the value of capacitance depend ?

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

// Page:13 //

18.

Write the difference between capacitors in series and parallel connections.

How does a capacitor store energy ? And obtain the formula for the energy stored in the

capacitor ?

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

// Page:14 //

19.

20.

How does a capacitor store energy ? And obtain the formula for the energy stored in the

capacitor ?

Obtain the expression for the energy stored per unit volume in a charged capacitor.

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

// Page:15 //

21.

Kumar Prakashan Kendra Welcome To Future M:91-7359 662200

// Page:16 //