MCQ
An electric dipole is placed in an electric field generated by a point charge.
- A
- B
- C
- D
✓
Answer
- The torque on the dipole due to the field may be zero.
Explanation:
In the uniform Electric field the net electric force on the dipole is alwas zero.
In uniform Electric field the torque on the dipole due to field may be zero.
T = 0
Here t Þ Torque
$\text{T}=2\text{qEl}\sin\text{q }\otimes\neq0$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Two uniform solid spheres having unequal masses and unequal radii are released from rest from the same height on a rough incline. If the spheres roll without slipping:
- The heavier sphere reaches the bottom first.
- The bigger sphere reaches the bottom first.
- The two spheres reach the bottom together.
- The information given is not sufficient to tell which sphere will reach the bottom first.
Three waves are given below. I. Sound waves, II. Visible light waves, III. X-rays. Which of the above waves cannot be polarised?
The electric potential decreases uniformly from 120V to 80V as one moves on the x-axis from x = -1cm to x = + 1cm. The electric field at the origin.
A radioactive nucleus 
decays to 
. Which of the following particles are emitted
|
(a) One alpha and one electron |
(b) Two deuterons and one positron |
|
(c) One alpha and one proton |
(d) One proton and four neutrons |
The resistivity of a wire varies with:
A cable of resistance 10 Ω carries electric power from a generator producing 250 kW at 10000 volt. The current in the cable is
|
(a) 25 A |
(b) 250 A
|
(c) 100 A |
(d) 1000 A |
Let there be a spherically symmetric charge distribution with charge density varying as $\text{p}(\text{r})=\text{p}_0\bigg(\frac{5}{4}-\frac{\text{r}}{\text{R}}\bigg)$ upto r = R and p(r) = 0 for r > R where r is the distance from the origin the electric field at a distance r(r < R) from the origin is given by.
→Wavefront of a wave has direction with wave motion:
Wave front formed by the collimator of a spectrometer:
A semiconductor is cooled from 
to 
Its resistance
|
(a) Will decrease |
|
(b) Will increase |
|
(c) Will first decrease and then increase |
|
(d) Will not change |