Aplane monochromatic radio wave (λ = 0.4 m) travels in vacuum along the positive x-axis, with a time-averaged intensity i = 25 w/m2. suppose at time t = 0, the electric field at the origin is measured to be directed along the positive y-axis with a magnitude equal to its maximum value. what is bz, the magnetic field at the origin, at time t = 2 ns? bz =

Explanation:

= Permittivity of free space =

c = Speed of light =

= Wavelength = 0.4 m

T = Time period

f = Frequency

= Electric field

Intensity of electric field is given by

Magnetic field is given by

Magnetic field in the z direction is given by (x=0)

The magnetic field at the origin is

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

because if the tool that you are using is not balanced it there would be false mass.