Question

6. A glass rod rubbed with silk acquires a charge of +8 x 10–12 C. The number of electrons it has gained or lost

a) 5 x 10–7

(gained) b) 5 x 107

(lost) c) 2 x 10–8

(lost) d) – 8 x 10–12 (lost)

7. A dipole is placed in a uniform electric field with its axis parallel to the field. It experiences

a) only a net force b) only a torque

c) both a net force and torque d) neither a net force nor a torque

8. The word done in moving 500 µc charge between two points on equipotential surface is

a) zero b) finite positive c) finite negative d) infinite

9. The number of electric lines of forces originating from a charge of 1C is

a) 1.129 x 1011 b) 1.6 x 10–19 c) 6.25 x 1018 d) 8.85 x 1012

10. The capacitance of a parallel plate capacitor increases from 5µf to 60 µf when a dielectric is filled between

the plates. The dielectric constant of the dielectric is

a) 65 b) 55 c) 12 d) 10

11. A hollow metal ball carrying an electric charge produces no electric field at points

a) outside the sphere b) on its surface c) inside the sphere d) at a distance more than twice

12. Electric potential energy of an electric dipole in an electric field is given as

a) pE sin θ b) – pE sin θ c) – pE cos θ d) pE cos θ

13. The direction of electric field at a point on the equatorial line due to an electric dipole is

a) along the equatorial line towards the dipole b) along the equatorial line away from the dipole

c) parallel to the axis of the dipole and opposite to the direction of dipole moment

d) parallel to the axis of the dipole and in the direction of dipole moment

14. The negative gradient of potential is

a) electric force b) torque c) electric current d) electric field intensity

15. The number of lines of force per unit area, through a plane at right angles to the lines, is proportional to

a) the magnitude of electric field b) the magnitude of charge

c) the magnitude of force d) none of the above

16. The capacitance of capacitors depends on _____

a) nature of the medium only b) geometry of the conductors only

c) both (a) and (b) d) neither (a) nor (b)

17. Four charges +q, +q, – q and – q respectively are placed at the corners A, B, C and D of a square of side a.

the electric potential at the centre O of the square is

a) 1

40





b) 1

40

2



c) 1

40

4



d) zero​

Answer 1

Answer:

HELLO

Explanation:HELLO

HELLO