A uniform plane wave at frequency of 300 Mhz travels in vacuum along +ydirection. The electric field of the wave at some instant is given as E = 3x + 5zV/m.1) Pi edict on the position of magnetic field vector with respect to electricfield vector2) Find the phase constant
Question
A uniform plane wave at frequency of 300 Mhz travels in vacuum along +ydirection. The electric field of the wave at some instant is given as E = 3x + 5zV/m.1) Pi edict on the position of magnetic field vector with respect to electricfield vector2) Find the phase constant
Solution
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To predict the position of the magnetic field vector with respect to the electric field vector, we can use the right-hand rule. According to the right-hand rule, if we point our thumb in the direction of the electric field vector (in this case, along the x-axis), then our fingers will curl in the direction of the magnetic field vector. Since the electric field vector is given as E = 3x + 5z V/m, the magnetic field vector will be perpendicular to the xz-plane and will point in the negative y-direction.
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To find the phase constant, we need to use the equation for a plane wave in vacuum. The equation is given as E = E0 * cos(k * r - ω * t + φ), where E is the electric field vector, E0 is the amplitude of the electric field, k is the wave vector, r is the position vector, ω is the angular frequency, t is the time, and φ is the phase constant.
In our case, the electric field vector is given as E = 3x + 5z V/m. Comparing this with the equation for a plane wave, we can see that the amplitude of the electric field, E0, is equal to √(3^2 + 0^2 + 5^2) = √34 V/m.
The wave vector, k, is related to the frequency, f, and the speed of light, c, by the equation k = 2πf/c. Given that the frequency is 300 MHz (or 300 * 10^6 Hz) and the speed of light is approximately 3 * 10^8 m/s, we can calculate the wave vector as k = 2π * (300 * 10^6) / (3 * 10^8) = 2π * 0.1 = 0.2π rad/m.
Now, we can write the equation for the electric field vector as E = √34 * cos(0.2π * r - ω * t + φ).
Since the wave is traveling in the +y direction, the position vector, r, can be written as r = y. Therefore, the equation for the electric field vector becomes E = √34 * cos(0.2π * y - ω * t + φ).
Comparing this with the given electric field vector E = 3x + 5z V/m, we can see that the y-component of the position vector is missing. This means that the phase constant, φ, must be zero.
Therefore, the phase constant is φ = 0.
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