Question

Ja 150m antenna transmitting at 1.2mhz (by ground wave)has an antenna current of 8a.what voltage is received by a receiving antenna of 2m height and 40km away

Answer 1

73thfm if tip of finding do not know what I was

Answer 2

Concept:

A voltage is defined as the electric potential difference per unit charge between the two points in an electric field.

Given:

Height of antenna, $h_t=150m$

Height of receiving antenna,$h_r=2m$

Frequency, $f=1.2MHz$

Antenna current, $I=8A$

Distance between antennas, $d=40km$

Find:

The voltage received by receiving antenna, $V_{Rx}$.

Solution:

The wavelength, $\lambda =\frac{c}{f}$ where $c$ is the speed of light.

So, $\lambda =\frac{c}{f}$

$\lambda =\frac{3\times 10^{8}}{1.2\times 10^{6}}$

$\lambda =250m$

The formula for voltage at the receiver side is:

$V_{Rx}=\frac{120\pi h_th_rI}{\lambda d}$

$V_{Rx}=\frac{120\pi \times 150\times 2\times 8}{250\times 40\times 10^{3}}$

$V_{Rx}=0.0905volts$

The voltage received by a receiving antenna is $0.0905volts$.

SPJ2