CBSE Class 12 Physics Important Questions from Past Exams

CBSE Class 12 Physics Important Questions from Past Exams. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations.  Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

CLASS XII

QUESTIONS FROM BOARD PAPERS

Name of the chapter: Electrostatics Name of the Topic:

1 Draw the equipotential surfaces corresponding to a uniform electric field.

2 Why two electric field lines do not intersect each other?

3 What is the relation between electric field at a point on the axial line and equatorial line due to a short electric dipole (a<<

4 Is it necessary that if the electric field is non zero the potential will also be non zero at a point. Give an example.

5 What is the relation between electric field and potential difference between two points lying along the electric field in a uniform electric field

Name of the chapter: Electrostatics

1 Draw electric field lines due to an electric dipole and a pair of equal positive charges.

2 Deduce the expression for the torque acting on a dipole of dipole moment p in the presence of a uniform electric field E.

3 Plot the graph showing the variation of electric field as a function of r, for r > R and r

4 A parallel plate capacitor of capacitance C is charged to a potential V. It is then connected to another uncharged capacitor of same capacitance. Find the ratio of the energy stored in the combined system to that stored initially in the single capacitor.

5 Derive the expression for the electrostatic energy stored in a capacitor of capacitance C and having charge ‘Q’.

NAME OF THE CHAPTER: Electrostatics Name of the Topic: 

Prepared by: ZIET GR. IV

1 Define electric dipole moment. Is it a scalar or a vector? Derive the expression for the electric field of a dipole at a point on the equatorial plane of the dipole.

2 Using Gauss’s theorem deduce the expression for electric field due to uniformly charged spherical conducting shell of radius R at a point (i) outside (ii) inside the shell

3 Derive the expression for electric field due to an infinite non conducting plane sheet of charge having surface charge density σ.

4 Derive the expression for electric field due to an infinitely long linear charge distribution having linear charge density λ.

5 Find the work done to rotate a dipole in a uniform electric field E from orientation ϴ₀ to ϴ₁.

6(VBQ) Mr. Bose was driving on a highway along fields. When a drizzle starts with lightning and thunderstorm. He spots a few farmers walking with iron spoke top umbrellas to

avoid getting wet. He stops his car and instructs his co passengers to keep sitting inside the car. He advises the farmers not to use the umbrella till the lightning subsides.

a. What are the two human qualities which Mr. Bose exhibited?

b. Why did he advise the farmers not to use the type of umbrella they were using?

c. Why did he advise his co passengers to sit inside the car and not to venture out?

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