Class 12 Physics Important Chapter 1 Electric Charge and Fields

Class 12 Physics Important Chapter 1 Electric Charge and Fields Solutions English Medium As Per The New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters ASSEB Class 12 Physics Additional Solutions in English and select need one. NCERT Class 12 Physics Additional Solutions Download PDF. HS 2nd Year Physics Important Solutions.

Class 12 Physics Important Chapter 1 Electric Charge and Fields

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. CBSE Class 12 Physics Additional Question Answer are part of All Subject Solutions. Here we have given HS 2nd Physics Important Solutions English Medium for All Chapters, You can practice these here.

Electric Charge and Fields

Chapter: 1

IMPORTANT QUESTION AND ANSWER

Answer The Following Questions:

1. Does the charge given to a metallic sphere depend on whether it is hollow or solid? Give reason for your answer.

Ans. No, the capacity to hold charge for spherical conductor is c = 4πε₀ r. It depends on radius and not on whether hollow or solid. 

2. Represent graphically the variation of electric field with distance, for uniformly charged plane sheet.

Ans: It is independent of the distance. It is a straight line parallel to x-axis.

3. Define the term ‘electric flux’. Write its SI unit.

Ans: Electric flux through an area is the product of magnitude of area and the component of electric field vector normal to it. 

ɸ = △s(E cos 𝚹)

The SI unit of electric flux is NC^-1m²

4. How does the electric flux due to a point charge enclosed by a spherical Gaussian surface get affected when its radius i increased?

Ans. Electric flux ( ɸ_E= q/ɛ₀) remains unchange because the change enclosed by the Gaussian surface remains same

5. What is the electric flux through a cube of side 1 cm which encloses an electric dipole?

Ans. Zero, because the net charge on an electric dipole in zero.

6. Two electric field lines never cross each other. Why?

Ans. If two field lines cross each other, then at the point of intersection there will be two tangents which is not possible.

7. Name any four vector fields.

Ans. Electric field, magnetic field, gravitational field and flow field are vector fields.

8. How does the force between two point charges change, if the dielectric constant of the medium in which they are kept, increases?

Ans. F_med = F_vac /K  i.e. F_med ∝ 1/ K

If the dielectric constant K of the medium increases, the force between the two charges decreases.

9. A proton is placed in a uniform electric field directed along the positive x-axis. In which direction will it tend to move?

Ans. As the proton has a positive charge, it will tend to move along positive x-axis i.e., along the direction of the electric field.

10. Define electric dipole moment. Write its SI unit.

Ans. 

11. What orientation of an electric dipole in a uniform electric field corresponds to its stable equilibrium?

Ans. When the electric dipole aligns itself along the direction of electric field 

the torque on the dipole becomes zero. Therefore, this orientation of the electric dipole (length parallel to the electric field) corresponds to its stable equilibrium.

12. Define dielectric constant of a medium.

Ans. The dielectric constant of a medium is defined as the ratio of the force between two charges placed some distance apart in the vacuum to the force between the same two charges separated by the same distance in the given medium. That is 

K= F_vac / F_med.

13. Why do the electric field lines not form closed loop?

Ans. As electric field lines never goes through negative potential to positive potential, thus, it can not form the closed loops.

14. In an electric field an electron is kept freely. If the electron is replaced by a proton, what will be the relationship between the forces experienced by them?

Ans. A proton has charge equal and opposite to that of an electron. Hence force experienced by a proton = – Force experienced by an electron.

15. How does the coulomb force between two point charges depend upon the dielectric constant of the intervening medium?

Ans: Inversely proportional to the dielectric constant of intervening medium, i.e. F∝ 1/ K.