12 - Physics - Unit 1 - Electro Statics
15 Questions
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Prepared by Mr. P. ILAIYARAJA M. Sc. ,B. Ed. , PG ASST IN PHYSICS , GHSS, PANCHANATHIKKULAM EAST, NAGAI DT. ; & www. Padasalai. Net
Questions and Answers
- 1.The electrostatic force between two point charges kept at a distance d apart, in a medium εr = 6, is 0.3 N. The force between them at the same separation in vacuum is
- A.
1.8 N
- B.
0.5 N
- C.
20 N
- D.
2 N
- 2.Elecric field intensity is 400 V m−1 at a distance of 2 m from a point charge. It will be 100 V m−1 at a distance?
- A.
4 m
- B.
4 cm
- C.
1.5 m
- D.
50 cm
- 3.Two point charges +4q and +q are placed 30 cm apart. At what point on the line joining them the electric field is zero?
- A.
20 cm from the charge 4q
- B.
15 cm from the charge q
- C.
7.5 cm from the charge q
- D.
5 cm from the charge q
- 4.A dipole is placed in a uniform electric field with its axis parallel to the field. It experiences
- A.
Neither a net force nor a torque
- B.
Only a torque
- C.
Both a net force and torque
- D.
Only a net force
- 5.The work done in moving 500 μC charge between two points on equipotential surface is
- A.
Zero
- B.
Finite positive
- C.
Finite negative
- D.
Infinite
- 6.Which of the following quantities is scalar?
- A.
Electric potential
- B.
Electric force
- C.
Electric field
- D.
Dipole moment
- 7.The capacitance of a parallel plate capacitor increases from 5 μf to 60 μf when a dielectric is filled between the plates. The dielectric constant of the dielectric is
- A.
12
- B.
55
- C.
65
- D.
10
- 8.
- A.
Inside the sphere
- B.
On its surface
- C.
Outside the sphere
- D.
At a distance more than twice
- 9.
![A glass rod rubbed with silk acquires a charge of . The number of electrons it has gained or lost
(1) (gained) (2) (lost)
(3) (lost) (4) (lost)]( "A glass rod rubbed with silk acquires a charge of . The number of electrons it has gained or lost
(1) (gained) (2) (lost)
(3) (lost) (4) (lost)")
- A.
(2)
- B.
(1)
- C.
(4)
- D.
(3)
- 10.
![If a point lies at a distance x from the midpoint of the dipole, the electric potential at this point is proportional to
(1) (2) (3) (4)]( "If a point lies at a distance x from the midpoint of the dipole, the electric potential at this point is proportional to
(1) (2) (3) (4)")
If a point lies at a distance x from the midpoint of the dipole, the electric potential at this point is proportional to (1) (2) (3) (4)- A.
(1)
- B.
(2)
- C.
(3)
- D.
(4)
- 11.
![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 center O of the square is
(1) (2) (3) (4) zero]( "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 center O of the square is
(1) (2) (3) (4) zero")
- A.
(4)
- B.
(3)
- C.
(2)
- D.
(1)
- 12.
![Electric potential energy (U) of two point charges is
(1) (2) (3) pE cos θ (4) pE sin θ]( "Electric potential energy (U) of two point charges is
(1) (2) (3) pE cos θ (4) pE sin θ")
Electric potential energy (U) of two point charges is (1) (2) (3) pE cos θ (4) pE sin θ- A.
(2)
- B.
(3)
- C.
(1)
- D.
(4)
- 13.
- A.
(1)
- B.
(2)
- C.
(3)
- D.
(4)
- 14.
![The number of electric lines of force originating from a charge of 1 C is
(1) (2) (3) (4)]( "The number of electric lines of force originating from a charge of 1 C is
(1) (2) (3) (4)")
The number of electric lines of force originating from a charge of 1 C is (1) (2) (3) (4)- A.
(1)
- B.
(2)
- C.
(3)
- D.
(4)
- 15.
![The electric field outside the plates of two oppositely charged plane sheets of charge density σ is
(1) (2) (3) (4) zero]( "The electric field outside the plates of two oppositely charged plane sheets of charge density σ is
(1) (2) (3) (4) zero")
- A.
(4)
- B.
(3)
- C.
(2)
- D.
(1)
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