Aconductor carrying 14.7 amps of current is directed along the positive x-axis and perpendicular to a uniform magnetic field. a magnetic force per unit length of 0.125 n/m acts on the conductor in the negative y direction. what is the strength of the magnetic field at the place where the current is? 0.0001 t

B = 0.009 T

Explanation:

The magnetic force is given by

    F = q vx B = i L x B

Bold quantities refer to vectors.

We are given some data the current (i 14.7 A), the force per unit length (F/L= 0.125 N / m)

We can take off in magnetic field since the current and the field are perpendicular, so the sine 90 = 1, write the magnitude of the equation

F = i L B

B = (F / L) 1 / i

B = 0.125    1/14.7

B = 0.009 T

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.