CBSE Class 12 Physics Electrostatics important questions

CBSE Class 12 Physics Electrostatics important questions. 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. 

Worksheet 1-A Name of the chapter: Electrostatics Name of the Topic:

Two equal balls having equal positive charge ‘q’ coulombs are suspended by two insulating strings of equal length .What would be the effect on the force when a plastic sheet is inserted between the two?

2 An electric dipole is held in a uniform electric field .What is the net force acting on it?

3 Net capacitance of three identical capacitors in series is 1μF. What will be their net capacitance if connected in parallel?

4 How will the (i) energy stored and (ii) the electric field inside the capacitance be affected when it is completely filled with a dielectric material of dielectric constant ‘K’.

5 Two charges of magnitude -2Q and +Q are located at point (a, o) and (4a, o)respectively . What is the electric flux due to these charges through a sphere of radius ‘4a’with its centre at the origin?

WORKSHEET 1-A NAME OF THE CHAPTER: Electrostatics Name of the Topic:

ANSWERS

1. Force reduces

2. Zero

3. 9μF

4. Energy increases k times of initial, and electric field reduces k times.

5. ᶲ = _-Q/€0 

Worksheet 1-BName of the chapter: Electrostatics

1 A charge ‘q’ is placed at the centre of a cube of side l. What is the electric flux passing through each face of the cube?

2 An electric dipole is held in a uniform electric field , Write the expression for torque acting on it?

3 Net capacitance of three identical capacitors in series is 1μF. Now they are connected in parallel ,Find the ratio of energy stored in the two configurations if they are both connected to the same source.

4 A spherical conducting shell of inner radius r₁ and r₂ has a charge ‘Q’ .A charge ‘q’ is placed at the centre of the shell. What is the surface charge density on the (i) inner surface.(ii) outer surface of the shell?

5 Two charges of magnitude -Q and +Q are located at point (a, o) and (4a, o)respectively . What is the electric flux due to these charges through a sphere of radius ‘4a’with its centre at the origin?

Answer Key

WORKSHEET 1-B NAME OF THE CHAPTER: Electrostatics Name of the Topic:

ANSWERS

1. ᶲ = _q/6€0

2. τ = pE sinϴ

3. 1: 9

4. (i) –q/4πr¹

2 (ii) Q+q/4πr²

5. ᶲ =ZeroWorksheet 1-C Name of the chapter: Electrostatics Name of the Topic

1 Define electric dipole moment. Write its SI unit .

2 An electric dipole isalligned parallel to a uniform electric field. Find the workdone in rotating it through the angle of 1800.

3 Name the physical quantity whose S.I unit is JC-1.Is it scalar or a vector quantity?

4 Two charges of magnitude -2Q and +Q are located at point (a, o) and (4a, o)respectively . What is the electric flux due to these charges through a sphere of radius ‘3a’with its centre at the origin?

5 A spherical shell of radius 2 cm has a charge 10μC at its centre. What is the work done in bringing a 5μC charge from one point on the surface to diametrically opposite point on the surface?

WORKSHEET 1-C NAME OF THE CHAPTER: : Electrostatics

Name of the Topic:

ANSWERS

1. THE Strength of a dipole is measured by a vector quantity known as dipole moment.It is product of either charge and dipole length. P= 2q.l , S.I Unit is Coulomb meter

2. W = 2PE

3. Electric Potential, Scalar quantity

4. ᶲ = _-2Q/€0

5. Zero

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