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- 1. Multiple Choice
An electric dipole is kept in non-uniform electric field. It experiences
A force and a torque
A force but not a torque
A torque but not a force
Neither a force nor a torque
- 2. Multiple Choice
An electric
dipole consisting of two opposite charges of 2×10 -6C each separated by a
distance of 3cm is placed in an
electric field of 2×105 N/C. The maximum torque on the dipole will be
12×10 -1Nm
12×10−3Nm
24×10−1Nm
24×10−3Nm
- 3. Multiple Choice
The distance between the two charges +q and –q of a dipole is r. On the axial line at a distance d from the centre of dipole, the electric field intensity is proportional to
q/d2
qr/d2
q/d3
qr/d3
- 4. Multiple Choice
If Ea be the
electric field strength of a short dipole at a point on its axial line
and Ee that on the equatorial line at the
same distance, then
Ee=2Ea
Ea=2Ee
Ea=Ee
None of the above
- 5. Multiple Choice
If the
magnitude of intensity of electric field at a distance x on axial
line and at a distance y on
equatorial line on a given dipole are equal, then x:y is
1:1
1:√2
1:2
2√3:1
- 6. Multiple Choice
The electric intensity due to a dipole of length 10 cm and having a charge of 500μC, at a point on the axis at a distance 20 cm from one of the charges in air, is
6.25×10^7 N/C
9.28×10^7 N/C
13.1×11^11N/C
20.5×10^7 N/C
- 7. Multiple Choice
What is the angle between the electric dipole moment and the electric field strength due to
it on the equatorial line?
0°
90°
180°
None of these
- 8. Multiple Choice
An electric dipole is placed in an
electric field generated by a point charge
The net electric force on the dipole must be zero
The net electric force on the dipole may be zero
The torque on the dipole due to the field must be zero
The torque on the dipole due to the field may be zero
- 9. Multiple Choice
When air is replaced by a dielectric medium of constant K, the maximum force of attraction between two charges separated by a distance
increases K times
remains unchanged
decreases K times
increases K-1 times
- 10. Multiple Choice
SI unit of permittivity of free space is
Farad
Weber
C2N-1 m-2
C2N-1 m-2
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