2025 Exam Questions
Q. Calculate the electric fields intensity at a point just near the surface of a charged plane sheet, measured from its mid-point.
\left[\sigma=8.85 \mu \mathrm{C} / \mathrm{m}^{2}\right]Q. State any four uses of Van de Graaff generator.
Q. In a parallel plate air capacitor, intensity of electric field is changing at the rate of 2 \times 10^{11} \mathrm{~V} / \mathrm{ms} . If area of each plate is 20 \mathrm{~cm}^{2} , calculate the displacement current.
2024 Exam Questions
Q. The work done in bringing a unit positive charge from infinity to a given point against the direction of electric field is known as____.
(a) electric flux
(b) magnetic potential
(c) electric potential
(d) gravitational potential
Q. Two capacitors of capacities 5μF and 10 μF respectively are connected in series. Calculate the resultant capacity of the combination.
Q.31 Derive an expression for energy stored in a charged capacitor.
Q. A spherical metal ball of radius 15 cm carries a charge of 2μC. Calculate the electric field at a distance of 20 cm from the center of the sphere.
2023 Exam Questions
Q. Obtain an expression for equivalent capacitance of two capacitors C1 and C2 connected in series.
Q. An electric dipole consists of two opposite charges each of magnitude 1 μC, separated by 2 cm. The dipole is placed in an external electric field of 105 N/C.
Calculate the:
i) maximum torque experienced by the dipole and
ii) work done by the external field to turn the dipole through 180o.
2022 Exam Questions
Q. The angle at which maximum torque is exerted by the external uniform electric field on the electric dipole is ____.
(A) 0o
(B) 30o
(C) 45o
(D) 90o
Q. State the formula for electric field intensity at a point outside an infinitely long charged cylindrical conductor.
Q. What are polar dielectrics and non-polar dielectrics?
Q. Draw neat, labelled diagram of a parallel plate capacitor with a dielectric slab between the plates.
Q. A small particle carrying a negative charge of 1.6 x 10-19 C is suspended in equilibrium between two horizontal metal plates 10 cm apart, having a potential difference of 4000 volts across them. Find the mass of the particle.
Q. A parallel plate capacitor filled with air has an area of 6 cm2 and plate separation of a 3 mm. Calculate its capacitance.
