4. Define „electric dipole‟. Give the expression for the magnitude of its
electric dipole moment and the direction.
5. Define “electrostatic potential”. (AUG 21, MAR 24)
6. What is an equipotential surface?
7. What are the properties of an equipotential surface
8. Define electro static potential energy‟.
9. Define „electric flux‟.
10. What is meant by electro static energy density?
11. Define „capacitance‟. Give its unit. (JUNE 23)
12. What is corona discharge? (or) action of point (MAY 22, MAR 20)
13. What are the differences between Coulomb force and gravitational force?
(MAR 23,25,JUNE 24)
14. State Gauss Law in electrostatics. (MAR 20, JULY 22)
15. State coulomb‟s law in electrostatics. (MAR 23)
16. Why is safer to be inside a car than standing under a tree during
lighting?
17. Potential in a given region is given as a function of distance 𝑥. 𝑉 =
5(𝑥2+ 𝑥) Volt. Find the electric field when 𝑥 = 1 𝑐𝑚. (SEP 20)
18. Dielectric strength of air is 3 × 106𝑉𝑚 −1. Suppose the radius of a
hollow sphere in the Van de Graff generator is 𝑅=0.4𝑚, calculate the maximum
potential difference created by this Van de Graaff generator. (Model 1.14)
(AUG 21)
19. A sample of HCl gas is placed in a uniform electric field of magnitude
3×104 NC–1
. The dipole moment of each HCl molecule is 3.4×10–30 Cm. Calculate the
maximum torque experienced by each HCl molecule. (Exam 1.11) (JUNE 24)
20. A parallel plate capacitor has two square plates of side 5 cm and
separated by a distance of 1 mm. Calculate the capacitance of this
capacitor. (Exam 1.20) (MAR 25)
12th Physics Chapter 1 Important 3 Marks
1. Derive an expression for the torque experienced by a dipole due to a
uniform electric field.
2. Derive an expression for electro static potential due to a point charge.
(MAR 23)
3. Obtain Gauss's law of electrostatics from Coulomb‟s law. (SEP 20, MAR 24)
4. Obtain the expression for capacitance for a parallel plate capacitor.
(JULY 22)
5. Obtain the expression for energy stored in the parallel plate capacitor.
(AUG 21)
6. Application and disadvantages of capacitor.
7. Properties of electric field line.
8. Derive the expression for resultant capacitance, when capacitors are
connected in series and in parallel.(MAY 22, MA 20)
9. Calculate the electric flux through the rectangle of sides 5 cm and 10 cm
kept in the region of a uniform electric field 100 NC–1.The angle θ is 60o
. If θ becomes zero, what is the electric flux? (Example 1.17) (JUNE 23)
12th Physics Chapter 1 Important - 5 Marks
1. Calculate the electric field due to a dipole on its axial line. (AUG 21,
MAR 24)
2. Calculate the electric field due to a dipole on its equatorial plane.
3. Derive an expression for electro static potential due to an electric
dipole. (MAY 22, JUNE 24)
4. Obtain the expression for electric field due to an infinitely long
charged wire. (MAR 20,25)
5. Obtain the expression for electric field due to an charged infinite plan
sheet.
6. Explain in detail the effect of introducing a dielectric medium between
the plates of a parallel plate
capacitor, when the capacitor is disconnected from the battery. (SEP 20)
7. Explain in detail the effect of introducing a dielectric medium between
the plates of a parallel plate
capacitor, when the capacitor is connected from the battery.
8. Explain in detail the principle, construction and working of a Van de
Graaff generator. (JULY 22, JUNE 2
Physics 2mark 3mark all lesson important questions pdf
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