english literature
IMPORTANT QUESTIONS IN PHYSICS (CLASS XII)
ELECTROSTATICS
One mark questions.
1. If a point charge is rotated in a circle of radius r around a charge q, what will be the be the work done?
2. Does the electric potential increase or decrease along the electric line of force?
3. Give the relation between electric intensity and electric flux.
4. What is the dielectric constant of a metal?
5. What is the potential energy of two equal negative point charges 2μC each held 1m apart in air?
6. In a certain 0.1m3 of space, electric potential is found to be 5V throughout. What is the electric field in this region?
7. Two spheres of silver of same radii, one solid and other hollow are charged to the same potential. Which one has greater charge?
8. Where does the energy of the capacitor reside?
9. Why does the electric field inside a dielectric decrease when it is placed in an external electric field?
10. A parallel plate capacitor has a capacity of 6μF in air and 60μF when dielectric medium is introduced. What is the dielectric constant of the medium?
11. The middle point of a conductor is earthed and its ends are maintained at a potential difference of 220V.What is the potential at the two ends and at the middle point?
12. Two insulated charged spheres of radii 10cm and 20cm having same charge are connected by a conductor and then they are separated. Which of the two spheres will carry more charge?
13. A capacitor is charged through a potential difference of 200V, when 0.1C charge is stored in it. How much energy will it release, when it is discharged?
14. What will be the effect on capacity of a parallel plate capacitor when area of each plate is doubled and distance between them is also doubled?
15. How will you obtain maximum capacitance from three given capacitors?
Two mark Questions
1. Equipotential surfaces are perpendicular to field lines. Why?
2. Suggest an arrangement for three point charges separated by infinite distance that has Zero
ELECTROSTATICS
One mark questions.
1. If a point charge is rotated in a circle of radius r around a charge q, what will be the be the work done?
2. Does the electric potential increase or decrease along the electric line of force?
3. Give the relation between electric intensity and electric flux.
4. What is the dielectric constant of a metal?
5. What is the potential energy of two equal negative point charges 2μC each held 1m apart in air?
6. In a certain 0.1m3 of space, electric potential is found to be 5V throughout. What is the electric field in this region?
7. Two spheres of silver of same radii, one solid and other hollow are charged to the same potential. Which one has greater charge?
8. Where does the energy of the capacitor reside?
9. Why does the electric field inside a dielectric decrease when it is placed in an external electric field?
10. A parallel plate capacitor has a capacity of 6μF in air and 60μF when dielectric medium is introduced. What is the dielectric constant of the medium?
11. The middle point of a conductor is earthed and its ends are maintained at a potential difference of 220V.What is the potential at the two ends and at the middle point?
12. Two insulated charged spheres of radii 10cm and 20cm having same charge are connected by a conductor and then they are separated. Which of the two spheres will carry more charge?
13. A capacitor is charged through a potential difference of 200V, when 0.1C charge is stored in it. How much energy will it release, when it is discharged?
14. What will be the effect on capacity of a parallel plate capacitor when area of each plate is doubled and distance between them is also doubled?
15. How will you obtain maximum capacitance from three given capacitors?
Two mark Questions
1. Equipotential surfaces are perpendicular to field lines. Why?
2. Suggest an arrangement for three point charges separated by infinite distance that has Zero