MCQ
A current carrying loop is placed in a uniform magnetic field. The torque acting on it does not depend upon:
- AShape of the loop.
- BArea of the loop.
- CValue of the current.
- DMagnetic field.
✓
Answer
- Shape of the loop.
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
A radio-isotope has a half- life of 5 years. The fraction of the atoms of this material that would decay in 15 years will be
|
(a) 1/8 |
(b) 2/3 |
(c) 7/8 |
(d) 5/8 |
The resistance of a 5 cm long wire is 10 W. It is uniformly stretched so that its length becomes 20 cm. The resistance of the wire is
|
(a) 160 W |
(b) 80 W |
(c) 40 W |
(d) 20 W |
Monochromatic light is refracted from air into the glass of refractive index μ. The ratio of the wavelength of incident and refracted waves is
|
(a) 1 : μ |
(b) 1 : |
(c) μ : 1 |
(d) 1 : 1 |
In intrinsic semiconductor at room temperature, number of electrons and holes are
|
(a) Equal |
(b) Zero |
(c) Unequal |
(d) Infinite |
The capacity of parallel plate condenser depends on
|
(a) The type of metal used |
(b) The thickness of plates |
|
(c) The potential applied across the plates |
(d) The separation between the plates |
64 small drops of mercury, each of radius r and charge q coalesce to form a big drop. The ratio of the surface density of charge of each small drop with that of the big drop is
|
(a) 1 : 64 |
(b) 64 : 1 |
(c) 4 : 1 |
(d) 1 : 4 |
The photoelectric work function for a metal surface is 4.125 eV. The cut-off wavelength for this surface is
|
(a) 4125 Å |
(b) 2062.5 Å |
(c) 3000 Å |
(d) 6000 Å |
Material A has critical angle 
and material B has critical angle 
. Then which of the following is true
(i) Light can be totally internally reflected when it passes from B to A
(ii) Light can be totally internally reflected when it passes from A to B
(iii) Critical angle for total internal reflection is 
(iv) Critical angle between A and B is 
|
(a) (i) and (iii) |
(b) (i) and (iv) |
(c) (ii) and (iii) |
(d) (ii) and (iv) |
The de-Broglie wavelength of a particle accelerated with 150 volt potential is 
m. If it is accelerated by 600 volts p.d., its wavelength will be
|
(a) 0.25 Å |
(b) 0.5 Å |
(c) 1.5 Å |
(d) 2 Å |
Which of the following is the same in parallel connection of resistances ?