Physics Test: Important Practice Questions On Electrostatics!
10 Questions
| Total Attempts: 846
(2).jpg "Physics Test: Important Practice Questions On Electrostatics!")
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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/x3/2
- 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/4πεoa
- B.
2q/4πεoa
- C.
4q/4πεoa
- D.
Zero
- 8.Electric potential energy (U) of two point charges is
- A.
Q1q2/4πεor2
- B.
Q1q2/4πεor
- 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
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