- Kinetic energy.
- Total mechanical energy.
- Potential energy.
- Total energy.
Explanation:
The potential energy of a two particle system depends only on the separation between the particles.
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A motor having an armature of resistance 2Ω is designed to operate at 220 V mains. At full speed, it develops a back e.m.f. of 210V. When the motor is running at full speed, the current in the armature is
|
(a) 5A |
(b) 105A |
(c) 110A |
(d) 215A |
An electron is revolving round a proton, producing a magnetic field of 16 weber/m2 in a circular orbit of radius 1Å. It’s angular velocity will be
|
(a) 1017 rad/sec |
(b) 1/2 π × 1012 rad/sec |
|
(c) 2π × 1012 rad/sec |
(d) 4 π × 1012 rad/sec |
When a ray of light emerges from a block of glass, the critical angle is
|
(a) Equal to the angle of reflection |
|
(b) The angle between the refracted ray and the normal |
|
(c) The angle of incidence for which the refracted ray travels along the glass-air boundary |
|
(d) The angle of incidence |
Two parallel slits 0.6 mm apart are illuminated by light source of wavelength 6000 Å. The distance between two consecutive dark fringes on a screen 1 m away from the slits is
|
(a) 1 mm |
(b) 0.01 mm |
(c) 0.1 m |
(d) 10 m |
The wavelength of radiation emitted is
when an electron jumps from the third to the second orbit of hydrogen atom. For the electron jump from the fourth to the second orbit of the hydrogen atom, the wavelength of radiation emitted will be
|
(a) |
(b) |
(c) |
(d) |
For the production of X-rays of wavelength 0.1 Å the minimum potential difference will be
|
(a) 12.4 kV |
(b) 24.8 kV |
(c) 124 kV |
(d) 248 kV |