A wire carrying current I has the shape as shown in the adjoining figure. Linear parts of the wire are very long and parallel to X -axis while semicircular portion of radius R is lying in a Y-Z plane. The magnetic field at point O is.
An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the centre has magnitude.
zero
A conducting square frame of side 'a' and a long straight wire carrying current I are located in the same plane as shown n the figure. The frame moves to the right with constant velocity 'v'. The emf induced in the frame will be proportional to
On observing light from three different stars P, Q and R, It was found that intensity of violet colour is maximum in the spectrum of P, the intensity of green colour is maximum in the spectrum of R and the intensity of red colour is maximum in the spectrum of Q. If TP, TQ and TR are the respective absolute temperature of P, Q and R, then it can conclude from the above observations that
TP > TQ>TR
TP > TR> TQ
TP > TR < TQ
TP > TR < TQ
A radiation of energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is
(c = velocity of light)
In a double slit experiment, the two slits are 1 mm apart and the screen is placed in 1 m away. A monochromatic light of wavelength 500nm is used. What will be the width of each slit for obtaining ten maxima of double slit within the central maxima of double slit within the central maxima of single slit pattern?
0.2mm
0.1 mm
0.5 mm
0.5 mm
The refracting angle of a prism is A, and the refractive index of the material of the prism is cot (A/2). The angle of minimum deviation is
180o-3A
180o-2A
90o-A
90o-A
B.
180o-2A
As, we know that,
Consider 3rd orbit of He+ (Helium), using non-relativistic approach, the speed of electron in this orbit will be (given K= 9 x 109 constant, Z=2 and h (Planck's constant = 6.6 x 10-34 Js-1
2.92 x 106 m/s
1.46 x 106 m/s
0.73 x 106 m/s
0.73 x 106 m/s
For a parallel beam of monochromatic light of wavelength 'λ'diffraction is produced by single slit whose width 'a' is of the order of the wavelength of the light. If 'D' is the distance of the screen from the slit the width of the central maxima will be
2Dλ/a
Dλ/a
Da/λ
Da/λ