PHYSICS-Electrostatics (SMART INSTITUTE)

01-When a dielectric is inserted between the plates of a capacitor, which one is true

02-Area under Q-V graph for a capacitor represents

03-The relative permittivity of air is

04-The potential gradient between the two charged plates having separation of 0.5 cm and potential difference of 12 volt is ...........NC-1

05-The potential difference between head and tail of an "electric eel" can be upto

06-Two point charges repel each other with a force of 4x10-5 newton at a distance of 1 meter. Two charges are

07-The energy stored in a unit volume of the dielectric between parallel plate of a capacitor is

08-Capacitance of a capacitor does not depend upon

09-A charge of 2C experiences a force 2000N in a uniform electric field. In this field the potential difference between two points separated by a distance 1 cm is

10-An @-particle is accelerated through potential difference 2000V. Its K.E will be

11-WOF is not the unit of electric intensity

12-The electrons separated by a distance 'r' experience a force F between them. The force between a proton and a singly ionized Helium atom separated by a distance 2r is

13-Static charges creates

14-Electric field lines are originated from

15-Capacitance with air is 10F, if a dielectric of Er=100 is inserted then new capacitance

16-The electrostatic force between two point charges q1 and q2 at separation r is given by F =kq1q2/r^2. The constant

17-How many electrons will have a charge of two coulomb?

18-Two charges are placed at a certain distance apart in air. When a metallic sheet is placed between them, the electrostatic force between them will

19-In central region of parallel plate capacitor, the electric field lines are

20-In a charged capacitor, the energy resides in

21-Value of Er for various dielectrics is always

22-If the distance between the two point charges become half, the force between them becomes

23-If F=kq1q2/r^2 then F/q1 is

24-The electric force between two charges placed in air is 2N. When placed in a medium of Er=80, the force reduces

25-If the distance between the two point charges become one-fourth, then force between them becomes ...........

26-An isolated charged point particle produces an electric field with magnitude E at a point 2m away. At a point 1m from the particle, the magnitude of the field is:

27-An ECG records .......... Between points on human skin.

28-An electric charge at rest produces

29-A gold nucleus (radius r) is represented by symbol Au-197. Taking e as the elementary charge and Eo as the permittivity of free space, what is the electric field strength at the surface of an isolated gold nucleus?

30-The quantity 1/2 εo ϵr E^2 has the significance of

31-Two electric charges originally 4cm apart are brought closer to each other until the force between them becomes of 4 times. How much they separated now?

32-A proton (mass=1.67 x 10^27 kg ) on entering in a vertical electric field E is balanced. Then the electric field strength is .......... Vm-1.

33-12 J of work is to be done against an existing electric field to take a charge of 0.01C from A to B. Find the potential difference between B and A.

34-A charged conductor has charge on its

35-On removing the dielectric from a charged capacitor, its energy

36-The electric field intensity at a point 20 cm away from a charge of 2 x 10^-5C is ..........N/C

37-Farad is not equivalent to

38-A and B are two points in an electric field. If the work done in carrying 4.0 coulombs of electric charge from A to B is 16.0 J, the potential difference between A and B is

39-The energy stored between the plates of a capacitor is not represented by

40-If the distance between two point charges to become double then the Coulomb's force will be

41-A capacitor of capacitance C is connected to battery of emf Vo. Without removing the battery, a dielectric of strength Er is inserted between the parallel plates of the capacitor c, THEN THE CHARGE ON THE CAPAITOR IS

42-A hollow sphere of Copper is positively charged. Then the electric field inside the sphere is

43-If a 10 F capacitor is to have an energy content of 20J, it must be placed across a potential difference of

44-The space between the plates of a capacitor is filled by a dielectric constant k. The capacitance of the capacitor

45-Two point charges are separated by a distance of 4m. The force between them is 4N. What is the force between the charges, when the distance between them is 1m.

46-Two identical metal balls with charges +2Q and -Q are separated by some distance, and exert a force F on each other. They are joined by a conducting wire, which is then removed. The force between them will be now.

47-Neutral zone in electric field of two similar charges is region where

48-Potential due to charge q at distance 1m is 5V, at distance 3m will be

49-If F is the force between two point charges submerged in a medium of dielectric constant K, then on withdrawing the medium, the force between the charges becomes

50-When 10^19 electrons are removed from a neutral metal plate, the electric charge on it is (coulomb)

51-If the potential difference across the two plates of a parallel plate capacitor is doubled then its energy stored in it will be

52-If the dielectric constant and dielectric strength be denoted by K and K' respectively, then a material suitable for use as a dielectric in a capacitor must have

53-A capacitor with air as the dielectric is charged to a potential of 100V. If the space between the plate is now filled with a dielectric of dielectric constant 10, the potential difference between the plates will be

54-While a capacitor remains connected to a battery, a dielectric slab is placed between the plates

55-Two metal plates have potential difference of 300 V and are 0.01 m apart. A charged particle of mass 1.96 x 10^-15 kg is held in equilibrium between the plates of the capacitor. Then the electric field is .........Vm-1

56-The electric field strength between a pair of parallel plates is E. The separation of the plates is doubled and the potential difference between the plates is increased by a factor of four. What is the new electric field strength?

57-How many electrons will have a charge of one Coulomb?

58-Two point charges +2C and +6C repel each other with a force of 12 N. If a charge of -2C is given to each of these charges, the force will now be

59-The difference of potential energy per unit charge is called

60-Relative permittivity of a material is 10, it's absolute or actual permittivity is ......... F/m