A deuteron of kinetic energy 50 keV is describing a circular orbits of radius 0.5 m in a plane perpendicular to the magnetic field B . The kinetic energy of the proton that describes a circular orbit of same radius and inside same B is-
(a) 25 kev
(b) 50 kev
(c) 200 kev
(d) 100 keV
(a) 25 kev
(b) 50 kev
(c) 200 kev
(d) 100 keV
(d) 100 keV
An alpha particle is moving perpendicularly to a uniform magnetic field of 3 Tesla with the velocity m/s. What is the work done by the particle?
(a) 30 × 10⁶ J
(b) 60 × 10⁶ J
(c) infinity
(d) zero
A Galvanometer of resistance 10 Ω gives full-scale deflection when 1 mA current passes through it. The resistance required to convert it into a voltmeter reading upto 2.5 Volt is;
a) 9800 Ω
b) 2490 Ω
c) 4980 Ω
d) 9880 Ω.
Two wires of same length are shaped into a square and a circle. If they carry same current, the ratio of their magnetic moment-
a) 2:π
b)π:2
c) 4:π
d) π:4.
The magnetic field at an outside point due to a long straight conductor carrying a constant current(I) is independent of
a) Material of the conductor
b) Radius of the conductor
c) Both (a) and (b)
d) Neither (a) nor (b)
A wire in the form of a circular loop, of one turn carrying a current, produces magnetic induction B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is-
a) B
b) 4B
c) 2B
d) 8B.
Two anti-parallel conducting wires carrying currents in the ratio 2:3. What is the nature of the force acting between them?
a) Attractive
b) Repulsive
c) Both attractive and Repulsive
d) can not predict.
Two sources of light are said to be coherent, when they give light waves of same
(a) amplitude and phase.
(b) wavelength and constant phase difference.
(c) intensity and wavelength.
(d) phase and speed.
Instead of using two slits as in Young’s experiment, if we use two separate but identical sodium lamps, which of the following occur?
(a) general illumination.
(b) widely separate interference.
(c) very bright maximum.
(d) very dark minimum.
The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 A is of the order of
(a) \(10^6\) rad
(b) \(10^{-2}\) rad
(c) \(10^{-4}\) rad
(d) \(10^{-6}\) rad
In a circuit with a coil of resistance 3Ω, the magnetic flux changes from 1.0 Wb to 10.0 Wb in 0.3 s. The charge that flows in the coil during this time is
(a) 2.0 C
(b) 3.0 C
(c) 4.0 C
(d) 1.0 C
In Young’s double slit experiment, the fringe width is β . If the entire arrangement is now placed inside a liquid of refractive index μ , the fringe width will become
(a) μ β
(b) β/μ
(c) β/μ+1
(d) β/μ−1
In the phenomenon of diffraction of light, when blue light is used in the experiment instead of red light, then
i. Fringes will become narrower
ii. Fringes will become broader
iii. No change in fringe width
iv. None of the above
In a double slit interference pattern, the first maxima for infrared light would be
a. at the same place as the first maxima for green light
b. closer to the centre than the first maxima for green light
c. farther from the centre than the first maxima for green light
d. infrared light does not produce an interference pattern