In a certain place, the horizontal component of magnetic field is times to vertical component. The angle of dip at this place is
zero
An alternating voltage e = 200 sin 100 t is applied to a series combination R = 30 Ω and an inductor of 400 mH. The power factor of the circuit is
0.01
0.2
0.6
0.042
The flux linked with a circuit is given by .The graph between time (x-axis) and induced emf (y-axis) will be a
straight line through the origin
straight line with positive intercept
parabola not through the origin
parabola through the origin
If the self-inductance of 500 tum coil is 125 mH, then the self inductance of similar coil of 800 turns is
48.8 mH
200 mH
187.5 mH
320 mH
A resistor 30 Ω, inductor of reactance 10 Ω and capacitor of reactance 10 Ω are connected in series to an AC voltage source . The current in the circuit is
10 A
A plane electromagnetic wave travelling along the X- direction has a wavelength of 3 mm. The variation in the electric field occurs in the Y-direction with an amplitude 66 Vm-1. The equations for the electric and magnetic fields as a function of x and t are respectively.
A plane electromagnetic wave travels in free space along x-axis. At a particular point in space, the electric field along y-axis is 9.3 Vm-1. The magnetic induction is
3.1 × 10-8 T
3 × 10-5 T
3 × 10-6 T
9.3 × 10-6 T
If the ratio of amounts of scattering of two light waves is 1 :4, the ratio of their wavelengths is
1 : 2
1 : 1
B.
From Rayleigh scattering concept,
In Young's experiment, the third bright band for light of wavelength 6000 coincides with the fourth bright band for another source of light in the same arrangement. Then the wavelength of second source is
If the angle of minimum deviation is of 60° for an equilateral prism, then the refractive index of the material of the prism is
1.41
1.5
1.73
1.33