Physics Test: Important Practice Questions On Electrostatics!

15 Questions | By RachaelBerry | Last updated: Mar 22, 2022 | Total Attempts: 1306

Questions

Settings

Create your own Quiz

Physics Test: Important Practice Questions On Electrostatics! - Quiz

Questions and Answers

1.

A glass rod rubbed with silk acquires a charge of +8 x 10^-12C. 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)
2.

The electrostatic force between two point charges kept at a distance d apart , in a medium εr =6, is 0.3N. The force between them at the same separation in vacuum is
- A.
  
  20 N
- B.
  
  0.5 N
- C.
  
  1.8 N
- D.
  
  2 N
3.

Electric field intensity is 400Vm^-1 at a distance of 2m from a point charge.It will be 100Vm^-1 at a distance?
- A.
  
  50 cm
- B.
  
  4 cm
- C.
  
  4 m
- D.
  
  1.5 m
4.

Two point charges +4q and +q are placed 30cm apart. At what point on the line joining them the electric field is zero?
- A.
  
  15 cm from the charge q
- B.
  
  7.5 cm from the charge q
- C.
  
  20 cm from the charge 4q
- D.
  
  5 cm from the charge q
5.

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
6.

If a point lies at a distance x from the midpoint of the dipole, the electric potential at this point is proportional to
- A.
  
  1/x²
- B.
  
  1/x³
- C.
  
  1/x⁴
- D.
  
  1/x^3/2
7.

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.
  
  Q/4πε_oa
- B.
  
  2q/4πε_oa
- C.
  
  4q/4πε_oa
- D.
  
  Zero
8.

Electric potential energy (U) of two point charges is
- A.
  
  Q₁q₂/4πε_or²
- B.
  
  Q₁q₂/4πε_or
- C.
  
  PE cosθ
- D.
  
  PE sinθ
9.

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
10.

Which of the following quantities is scalar?
- A.
  
  Dipole moment
- B.
  
  Electric force
- C.
  
  Electric field
- D.
  
  Electric potential
11.

The unit of permittivity is
- A.
  
  C²N^-1m^-2
- B.
  
  Nm²C^-2
- C.
  
  Hm^-1
- D.
  
  NC^-2m^-2
12.

The number of electric lines of force 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
13.

The electric field outside the plates of two oppositely charged plane sheets of charge density σ is
- A.
  
  +σ/2εσ
- B.
  
  -σ/2εσ
- C.
  
  σ/ε_o
- D.
  
  Zero
14.

The capacitance of a parallel plate capacitor increases from 5μf to 60μf when a dielectric is filled between the plates.The dielectric constant of the dielectric is
- A.
  
  65
- B.
  
  55
- C.
  
  12
- D.
  
  10
15.

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